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FOOD PRODUCTION - Q&A

Review Questions

Multiple Choice Questions:

1. Put a tick mark (✓) against the correct alternative in the following statements:

(i) Which one of the following is an indigenous breed of dairy cows ? (a) Jersey (b) Frieswal (c) Sahiwal (d) Dangi
Answer: (c) Sahiwal

Explanation: Sahiwal is a popular indigenous (local Indian) breed. Jersey is an exotic breed, and Frieswal is a cross-breed.

(ii) Which one of the following is the common breed of buffalo found in Gujarat ? (a) Surti (b) Murrah (c) Gir (d) Mehsana
Answer: (a) Surti

Explanation: Surti is a breed of buffalo native to Gujarat (Surat). Murrah is typically from Punjab/Haryana. Gir is a breed of cow, not buffalo.

(iii) Which one of the following is a bacterial disease of cattle in which the animal gets swelling on body parts, especially on the neck ? (a) Cow pox (b) Anthrax (c) Salmonellosis (d) Rinderpest
Answer: (b) Anthrax

Explanation: According to the disease table in the chapter, Anthrax is a bacterial disease characterized by swelling on body parts, especially the neck.

(iv) Identify the indigenous breed of poultry of India : (a) White leghorn (b) HH-260 (c) Aseel (d) B-77
Answer: (c) Aseel

Explanation: Aseel is a popular indigenous poultry breed. White Leghorn is exotic, and HH-260/B-77 are cross-breeds.

(v) Which one of the following is a viral disease of poultry ? (a) Ranikhet disease (b) Cholera (c) Coryze (d) Aspergillosis
Answer: (a) Ranikhet disease

Explanation: Ranikhet and Fowl pox are listed as viral diseases. Cholera and Coryze are bacterial, and Aspergillosis is fungal.

(vi) One of the following is a bacterial disease of sheep and goat. Identify it. (a) Sore mouth (b) Rinderpest (c) Goat pox (d) Brucellosis
Answer: (d) Brucellosis

Explanation: The text lists Black quarter, Brucellosis, and Vibriosis as bacterial diseases. Sore mouth, Goat pox, and Rinderpest are viral.

(vii) Which one of the following is a rabi crop (a) Mustard (b) Pea (c) Rice (d) Wheat
Answer: (d) Wheat

Explanation: While Mustard and Pea are also grown in winter (Rabi season), Wheat is the most significant and primary cereal example of a Rabi crop given in the text. Rice is a Kharif crop.

(viii) The plants that live for more than two years are called : (a) Annuals (b) Perennials (c) Biennials (d) Triennials
Answer: (b) Perennials

Explanation: Perennials are plants that live for more than two years (e.g., Mango, Rose). Annuals live for one season, and Biennials for two years.

(ix) Identify the Kharif crop. (a) Barley (b) Mustard (c) Rice (d) Wheat
Answer: (c) Rice

Explanation: Kharif crops are sown in the rainy season (July to October). Rice (paddy) is the most important Kharif crop. Wheat, Barley, and Mustard are Rabi crops.


Short Answer Questions :

1. Answer the following questions :

(i) Name any four animals which provide us food.
Answer: Cow, Buffalo, Goat, and Hen (Poultry).

Explanation: These animals provide milk, meat, and eggs.

(ii) Name any two dual purpose breeds of cattle.
Answer: Hariana and Tharparkar.

Explanation: Dual purpose breeds are used for both milk production and draught work (labour).

(iii) Name any two diseases of cattle caused by viruses.
Answer: Foot and mouth disease and Rinderpest (cattle plague).

Explanation: These are listed in the chapter as viral diseases affecting cattle.

(iv) Name any two bacterial diseases of cattle.
Answer: Anthrax and Salmonellosis. (v) What are the symptoms of foot and mouth disease ?
Answer: The symptoms include blisters on feet and mouth, excessive salivation, reduced appetite, and soreness of the mouth. (vi) Give two examples of milch animals.
Answer: Cow and Buffalo.

Explanation: "Milch" animals are milk-yielding animals.

(vii) Name any two high-yielding indigenous breeds of cow.
Answer: Sahiwal and Gir. (viii) Name four varieties of edible fishes of India.
Answer: Rohu, Catla, Hilsa, and Pomphret.

Explanation: These are common marine and fresh water edible fish mentioned in the text.

(ix) Name two breeds of buffaloes.
Answer: Murrah and Surti. (x) Name two bacterial diseases of poultry.
Answer: Fowl cholera and Salmonellosis.



2. Fill in the blanks :

(i) Cattle feed made from cereals and wheat is called Concentrates.

Explanation: Feed is divided into Roughage (fiber) and Concentrates (nutrient-rich grains/seeds).

(ii) Rearing of birds for egg and meat is called Poultry farming. (iii) Animal food is rich in Proteins.

Explanation: Animal products like milk, eggs, and meat are primary sources of protein.


3. Briefly explain the following terms :

Animal husbandry :
Answer: Animal husbandry is the branch of agriculture concerned with the rearing, breeding, and caring of domestic animals (livestock) to obtain food and other useful products like milk, meat, wool, etc.

Sericulture :
Answer: The commercial rearing of silkworms for the production of silk is called sericulture. It involves raising the silkworm larvae on mulberry leaves to obtain cocoons.

Aquaculture :
Answer: Aquaculture is the production of useful aquatic plants and animals (like fish, prawns, lobsters, crabs, etc.) in water bodies.

Hatcheries :
Answer: Hatcheries are nurseries in fish farming where fish eggs (known as fish seeds) are put to hatch into young ones.

Pisciculture :
Answer: Pisciculture is the specific rearing and management of fish (fish farming) for food production.



4. Name the following :

(i) The popular indeginous breed of poultry of India.
Answer: Aseel.

(ii) Rearing of honey bee
Answer: Apiculture.

(iii) A cross-breed of hen
Answer: HH-260 (or IBL-80).

(iv) A kashmiri goat which gives expensive wool
Answer: Pashmina.

(v) A viral disease of sheep
Answer: Sore mouth (or Goat pox / Rinderpest).

5. Match the columns Column A

(a) Rabi crop (b) Rice crop (c) Orchards

Column B (i) Transplantation (ii) Winter crop (iii) Kharif crop

Answer:
(a) Rabi crop — (ii) Winter crop
(b) Rice crop — (iii) Kharif crop
(c) Orchards — (i) Transplantation

Explanation: Rabi crops are grown in winter. Rice is the main Kharif crop. Plants for orchards (fruits/flowers) are typically grown in nurseries and then transplanted. Note: In the text, "Transplantation" is specifically described for Paddy (Rice), but since Rice is definitely Kharif and Rabi is definitely Winter, "Orchards" matching with "Transplantation" is the most logical remaining fit in this context.


6. What is organic farming ?
Answer: Organic farming is the practice of raising crops without using chemical fertilizers, pesticides, or weedicides. It relies on organic manure, crop rotation, and biological control for pests to maintain soil fertility and produce healthy food.
Long Answer Questions (Write the answers in your note-book) :

1. Give any five features of good shelter for milch animals.
Answer: 1. The shelter should be clean, dry, and airy (well-ventilated).
2. It should protect the animals from heat, cold, and rain.
3. The floor should be sloping to allow easy drainage of urine and water.
4. It should have proper arrangements for feeding and drinking water.
5. It should be spacious enough for the animals to stay comfortably.

2. What type of food you would suggest for cattle in order to get good quality of milk ?
Answer: To get good quality milk, cattle should be given a balanced diet consisting of:
1. Roughage: Coarse and fibrous substances like hay, green fodder, and legumes (like berseem) which provide bulk but are low in nutrients.
2. Concentrates: Nutrient-rich food low in fiber, such as grains of maize, jowar, bajra, oil cakes (cotton seeds), and rice/gram bran. This ensures the animal gets necessary proteins, fats, vitamins, and minerals.

3. Write any five symptoms of sick cattle.
Answer: 1. The animal stops feeding.
2. Milk yield is significantly reduced.
3. The animal becomes inactive and looks tired.
4. Drooping of lips and ears.
5. Passing of loose dung or colored urine.

4. Differentiate between an egger and a broiler.
Answer:
Eggers (Layers): These are chickens reared primarily for the production of eggs. They are kept to lay eggs.
Broilers: These are chickens reared primarily to obtain meat. They are grown for a short period to gain weight quickly for food.

5. Name any two exotic breeds of fowl in India, and mention their usefulness.
Answer: Two exotic breeds are White Leghorn and Rhode Island Red.
Usefulness:
1. White Leghorn is small in size, requires less feed, and produces oval white eggs (good egger).
2. Rhode Island Red is a dual-type breed developed in the USA, good for both meat and eggs.

6. What are "milch animals"? Give three examples of exotic breeds of cow.
Answer: Milch animals are milk-yielding animals kept for obtaining milk (e.g., cows, buffaloes, goats).
Three examples of exotic breeds of cow are:
1. Jersey
2. Holstein-Friesian
3. Brown Swiss

7. What is the meaning of the term "aquaculture"? Name any three animals which can be cultured by this method.
Answer: Aquaculture refers to the production of useful aquatic plants and animals in water bodies (rivers, lakes, ponds, or sea). It is also known as "farming of water".
Three animals that can be cultured are:
1. Fish (e.g., Rohu, Catla)
2. Prawns
3. Lobsters (or Oysters)

8. Differentiate between food crops and cash crops, and give two examples of each.
Answer:
Food Crops: Crops cultivated primarily for the production of food to be consumed by humans.
Examples: Cereals (Wheat, Rice), Pulses.
Cash Crops: Crops cultivated for commercial purposes to be sold for profit or used as raw material for industries.
Examples: Rubber, Tea, Cotton, Spices.

9. What are kharif crops ? Give the name of the most important cereal plant of such crops. Briefly describe any three methods for cultivation of kharif crops.
Answer: Kharif Crops: Crops raised in the rainy season (from July to October) are called Kharif crops. They require substantial rainfall.
Most important cereal: Rice (Paddy).
Methods of cultivation:
1. Broadcasting: Seeds are scattered or thrown over the soil by hand.
2. Dibbling: Dropping seeds at regular intervals into furrows made by a plough.
3. Transplantation: Seeds are first sown in a nursery. Once they grow into tiny seedlings, healthy ones are picked and replanted (transplanted) into the main flooded field.

10. Name the two main crop seasons of India. Give three examples of the crops grown during each season.
Answer: The two main crop seasons are:
1. Kharif Season (Rainy/Autumn):
Examples: Rice, Maize, Bajra (or Cotton/Groundnut).
2. Rabi Season (Winter):
Examples: Wheat, Barley, Mustard (or Pea/Gram).

11. Briefly describe the industrial uses of bacteria.
Answer: Bacteria are useful in industries in the following ways:
1. Curd Making: Lactobacillus bacteria ferment milk sugar (lactose) into lactic acid to form curd.
2. Tanning of Leather: Bacteria are used to treat animal skins to remove flesh and make them soft.
3. Retting of Fibres: Bacteria help separate fibres of jute, flax, and hemp from the stem.
4. Curing of Tea/Tobacco: Bacteria provide specific flavors to tea and tobacco leaves.
5. Production of Vitamins/Antibiotics: Some bacteria are used to produce B-complex vitamins and antibiotics.

12. Name any two varieties of edible mushrooms. How you would cultivate mushrooms in your own house.
Answer: Varieties: White button mushroom (Agaricus bisporous) and Paddy straw mushroom (Volvariella).
Cultivation Steps:
1. Composting: Prepare compost using wheat/paddy straw and chicken manure kept at 50°C for a week.
2. Spawning: Introduce "mushroom seed" (mycelium) into the compost and let it spread for a couple of days.
3. Casing: Spread a thin layer of soil over the compost to provide support and humidity.
4. Cropping and Harvesting: Small pin heads appear and grow into button stage mushrooms, which are then harvested.

13. Write briefly the processes of (i) wine (alcohol) making and (ii) bread making.
Answer: (i) Wine Making: Grapes are crushed to extract juice containing sugar. Yeast is added to the juice in a large vessel (without oxygen). The yeast ferments the sugar, converting it into alcohol. This process is called alcoholic fermentation.
(ii) Bread Making: Flour is mixed with water, sugar, and yeast to make dough. The dough is left in a warm place. The yeast multiplies and ferments the sugar, releasing carbon dioxide gas. This gas gets trapped in the dough, causing it to rise (swell). When baked, the gas escapes, leaving the bread soft and spongy.

14. Mention the benefits of "Green revolution" in our country.
Answer: The Green Revolution refers to the tremendous increase in the production of food crops (especially wheat) in India over the last 30-40 years.
Benefits:
1. It made India self-sufficient in food grain production.
2. It introduced high-yielding varieties of seeds.
3. It promoted the use of modern agricultural practices like irrigation, fertilizers, and pesticides.
4. It improved the economic condition of farmers and ensured food security for the growing population.

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Multiple Choice Questions - Test your understanding with these MCQs. Click "Show Answer" to reveal the correct answer.

Question 1What is the science that deals with the study of microorganisms called?

Correct Answer: Microbiology

Question 2Who is considered the 'father of microbiology'?

Correct Answer: Leeuwenhoek

Question 3Which of these is a primitive characteristic of a bacterial cell structure?

Correct Answer: Primitive nuclear material without a membrane

Question 4What is the thread-like structure that helps some bacteria move?

Correct Answer: Flagellum

Question 5Which shape describes 'bacillus' bacteria?

Correct Answer: Rod-shaped

Question 6Which pH level is generally favoured by most bacteria for growth?

Correct Answer: pH 7.4 (slightly alkaline)

Question 7Bacteria that flourish in the presence of oxygen are called:

Correct Answer: Aerobes

Question 8What is the primary action of bacteria in the process of curd making?

Correct Answer: Converting lactose into lactic acid

Question 9Which bacterial species is commonly used in curd making?

Correct Answer: Lactobacillus bulgaricus

Question 10Why is curd considered beneficial for adults regarding bone health?

Correct Answer: It is high in calcium to prevent osteoporosis

Question 11What is 'cottage cheese' specifically?

Correct Answer: Curd processed to remove moisture

Question 12In cheese making, what is the purpose of 'salting'?

Correct Answer: To further remove moisture and prevent undesirable microbes

Question 13Where are nitrogen-fixing bacteria typically found?

Correct Answer: In the nodules of leguminous plant roots

Question 14What do nitrogen-fixing bacteria convert free nitrogen into?

Correct Answer: Soluble nitrates

Question 15Which industrial process involves bacteria to separate fibres from stems like jute?

Correct Answer: Retting

Question 16Which bacterium is capable of breaking down hydrocarbons in oil spills?

Correct Answer: Pseudomonas

Question 17How do bacteria help herbivorous animals like cows in nutrition?

Correct Answer: By helping in the digestion of cellulose

Question 18Why are fungi and bacteria called 'saprophytes'?

Correct Answer: Because they live on dead and decaying organic matter

Question 19What is the common name for the fungus that grows on stale bread?

Correct Answer: Bread mould

Question 20Which of these is the most common edible mushroom eaten worldwide?

Correct Answer: Agaricus bisporous

Question 21In mushroom cultivation, what is 'spawning'?

Correct Answer: Introducing 'mushroom seed' (mycelium) into compost

Question 22What is the purpose of 'casing' in mushroom cultivation?

Correct Answer: Spreading a thin layer of soil to provide support and humidity

Question 23What are the three principal stages of mushroom growth during cropping?

Correct Answer: Mycelium, Tiny pin heads, Button stage

Question 24Which of these is a method used to preserve highly perishable mushrooms?

Correct Answer: Exposure to gamma radiation

Question 25What is a unique characteristic of yeast among fungi?

Correct Answer: They are all one-celled

Question 26How does yeast primarily respire in the absence of oxygen?

Correct Answer: Anaerobically

Question 27What are the end products of anaerobic respiration in yeast?

Correct Answer: Ethanol, Carbon dioxide, and ATP

Question 28What is the asexual method of reproduction in yeast?

Correct Answer: Budding

Question 29In bread making, what causes the dough to rise?

Correct Answer: Carbon dioxide gas given off during fermentation

Question 30Why does fermentation usually stop when alcohol concentration reaches 13-14%?

Correct Answer: The high concentration of alcohol kills the yeast

Question 31How are spirits like whisky and rum produced to be stronger than wine?

Correct Answer: Distillation after fermentation

Question 32What is 'brewing' specifically related to?

Correct Answer: Making beer from barley

Question 33Agriculture is defined as the science of growing food crops and:

Correct Answer: Other crops useful to mankind

Question 34Crops cultivated specifically for commercial purposes are called:

Correct Answer: Cash crops

Question 35Which of these is an example of a 'cereal crop'?

Correct Answer: Rice

Question 36Which nutrient are pulses particularly rich in?

Correct Answer: Proteins

Question 37What does the term 'Kharif' refer to in the context of crops?

Correct Answer: Autumn crops (raised in rainy season)

Question 38Which is the most important Kharif crop in India?

Correct Answer: Rice

Question 39What is the 'transplantation' method in rice cultivation?

Correct Answer: Transferring healthy seedlings from nurseries to the field

Question 40Rabi crops are also known as:

Correct Answer: Winter crops

Question 41Which is the most important Rabi crop in India?

Correct Answer: Wheat

Question 42Plants that complete their life cycle in one year or season are called:

Correct Answer: Annuals

Question 43A plant like the carrot that lives for two years/seasons is a:

Correct Answer: Biennial

Question 44Which of these is a 'perennial' plant?

Correct Answer: Mango

Question 45What is the core practice of 'organic farming'?

Correct Answer: Raising crops without inorganic fertilizers and pesticides

Question 46Who played a major role in the Green Revolution in India?

Correct Answer: M.S. Swaminathan

Question 47What does 'Green Revolution' specifically refer to in India?

Correct Answer: Increase in wheat production over the last 30 years

Question 48In cattle feed, what is 'roughage'?

Correct Answer: Coarse, fibrous substance with low nutrient content

Question 49When are 'concentrates' primarily served to animals?

Correct Answer: During the lactation period

Question 50Which cattle disease is caused by a virus and shows symptoms of blisters on the feet and mouth?

Correct Answer: Foot and mouth disease
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True or False Questions - Determine whether each statement is true or false. Click "Show Answer" to reveal the correct answer.

Statement 1Microbiology is the science that deals with the study of organisms that cannot be seen with the naked eye.

Correct Answer: True

Statement 2Leeuwenhoek is known as the father of microbiology.

Correct Answer: True

Statement 3Most microorganisms, such as bacteria and viruses, are multicellular.

Correct Answer: False

Statement 4Bacteria were among the first living organisms to appear on Earth.

Correct Answer: True

Statement 5A round-shaped bacterium is called a bacillus.

Correct Answer: False

Statement 6Vibrio is the name given to comma-shaped bacteria.

Correct Answer: True

Statement 7Bacterial cells possess a primitive nucleus without a nuclear membrane.

Correct Answer: True

Statement 8The flagellum is a thread-like structure used by some bacteria for movement.

Correct Answer: True

Statement 9Most bacteria grow best in highly acidic conditions.

Correct Answer: False

Statement 10Aerobes are bacteria that flourish in air containing oxygen.

Correct Answer: True

Statement 11Obligate anaerobes require oxygen to survive.

Correct Answer: False

Statement 12Biotechnology involves using microorganisms to make end products useful to mankind.

Correct Answer: True

Statement 13Curd is formed by the action of bacteria on the sucrose in milk.

Correct Answer: False

Statement 14Lactobacillus bulgaricus is a bacterium commonly used in making curd.

Correct Answer: True

Statement 15The lactic acid produced by bacteria gives curd its tangy taste.

Correct Answer: True

Statement 16Curd is a rich source of calcium, which helps prevent osteoporosis.

Correct Answer: True

Statement 17Cheese manufacture involves curdling milk with the addition of lactic acid bacteria.

Correct Answer: True

Statement 18Cottage cheese is the term used for curd after moisture has been fully removed and it has been ripened.

Correct Answer: False

Statement 19Salting cheese helps prevent the growth of undesirable microorganisms.

Correct Answer: True

Statement 20Nitrogen-fixing bacteria are found in the root nodules of leguminous plants.

Correct Answer: True

Statement 21Nitrogen-fixing bacteria convert nitrates into free nitrogen gas.

Correct Answer: False

Statement 22Tanning animal skins involves treating them with bacteria to make them soft.

Correct Answer: True

Statement 23Retting bacteria are used to separate fibres from the stems of plants like jute and flax.

Correct Answer: True

Statement 24Pseudomonas bacteria can be used to break down oil spills in water.

Correct Answer: True

Statement 25Biogas is produced from human and animal excreta through bacterial activity.

Correct Answer: True

Statement 26Some bacteria in the human intestine synthesize 'B' vitamins.

Correct Answer: True

Statement 27Bacteria help in the digestion of cellulose in the intestines of herbivorous animals like cows.

Correct Answer: True

Statement 28Fungi possess chlorophyll and can prepare their own food.

Correct Answer: False

Statement 29Saprophytes are organisms that live on dead and decaying organic matter.

Correct Answer: True

Statement 30Bread mould is a type of fungus that creates a blackish cottony growth on stale bread.

Correct Answer: True

Statement 31All varieties of wild mushrooms are safe for human consumption.

Correct Answer: False

Statement 32Agaricus bisporous is a common edible mushroom eaten worldwide.

Correct Answer: True

Statement 33Mushroom cultivation is typically done outdoors because it requires vast land area.

Correct Answer: False

Statement 34Compost for mushrooms can be prepared using wheat or paddy straw and chicken manure.

Correct Answer: True

Statement 35Spawning refers to the introduction of 'mushroom seed' into the compost.

Correct Answer: True

Statement 36Casing helps regulate temperature and provide support during mushroom growth.

Correct Answer: True

Statement 37Mushrooms are highly perishable and have a short shelf life without preservation.

Correct Answer: True

Statement 38Yeasts are multicellular fungi classified under the genus Saccharomyces.

Correct Answer: False

Statement 39Yeast cells are typically ovoid in shape and have a distinct cell wall.

Correct Answer: True

Statement 40Yeast respires anaerobically to produce ethanol and carbon dioxide.

Correct Answer: True

Statement 41The primary method of asexual reproduction in yeast is budding.

Correct Answer: True

Statement 42Wine is made when yeast ferments the sugar in fruit juices into alcohol.

Correct Answer: True

Statement 43Brewing is the process used to make beer from barley.

Correct Answer: True

Statement 44Alcohol levels above 14 percent in a fermenting liquid usually kill the yeast.

Correct Answer: True

Statement 45Distillation is the only way to produce alcoholic drinks with a higher alcohol content than wine or beer.

Correct Answer: True

Statement 46In bread making, carbon dioxide gas causes the dough to rise.

Correct Answer: True

Statement 47Agriculture is defined as the science of growing food crops and other useful crops.

Correct Answer: True

Statement 48Food crops are cultivated primarily for commercial purposes like rubber and tea.

Correct Answer: False

Statement 49Cereals are a major source of proteins in the human diet.

Correct Answer: False

Statement 50Pulses, such as peas and beans, are rich in proteins.

Correct Answer: True
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Fill in the Blanks - Complete the sentences by filling in the missing words. Click "Show Answer" to check your response.

Question 1The science which deals with the study of microorganisms is called ______.

Correct Answer: microbiology

Question 2Microorganisms that are extremely small and cannot be seen by the naked eye are also called ______.

Correct Answer: microbes

Question 3______ is known as the father of microbiology and was the first to describe the shapes of bacteria.

Correct Answer: Leeuwenhoek

Question 4Most microorganisms like bacteria, algae, and protozoans are ______ organisms.

Correct Answer: unicellular

Question 5A round-shaped bacterium is technically referred to as ______.

Correct Answer: coccus

Question 6Rod-shaped bacteria are called ______.

Correct Answer: bacillus

Question 7Spring-shaped bacteria are known as ______.

Correct Answer: spirillum

Question 8Comma-shaped bacteria are referred to as ______.

Correct Answer: vibrio

Question 9A bacterial cell has primitive nuclear material without a ______ membrane.

Correct Answer: nuclear

Question 10The outermost slimy, protective layer of a bacterial cell is the ______.

Correct Answer: capsule

Question 11Certain bacteria move with the help of a thread-like structure called a ______.

Correct Answer: flagellum

Question 12Most bacteria grow best in slightly ______ conditions with a pH of 7.4.

Correct Answer: alkaline

Question 13Bacteria that require oxygen to flourish are called ______.

Correct Answer: aerobes

Question 14Bacteria that can survive in the absence of oxygen are known as ______ anaerobes.

Correct Answer: facultative

Question 15The process of using microorganisms to make useful end products is called ______.

Correct Answer: biotechnology

Question 16Curd is formed by the action of bacteria on the ______ sugar found in milk.

Correct Answer: lactose

Question 17Bacteria produce ______ acid, which reduces the pH and gives curd its tangy taste.

Correct Answer: lactic

Question 18Curd is high in ______, which is important for bone growth and preventing osteoporosis.

Correct Answer: calcium

Question 19To start fermentation in a new batch of milk, a small amount of curd called ______ is added.

Correct Answer: starter

Question 20At the stage where curd is processed to remove moisture, it is called ______ cheese.

Correct Answer: cottage

Question 21______ is a step in cheese making that removes moisture and prevents the growth of undesirable microbes.

Correct Answer: Salting

Question 22Bacteria found in the ______ of leguminous plants help in fixing free nitrogen.

Correct Answer: nodules

Question 23Nitrogen-fixing bacteria convert soil nitrogen into soluble ______, which are useful fertilizers.

Correct Answer: nitrates

Question 24______ bacteria help in separating the fibres of stems like jute and hemp.

Correct Answer: Retting

Question 25Bacteria such as ______ are capable of breaking down hydrocarbons in oil spills.

Correct Answer: Pseudomonas

Question 26Biogas used for cooking is produced from excreta through ______ activity.

Correct Answer: bacterial

Question 27Bacteria in the human intestine help synthesize certain ______ vitamins.

Correct Answer: B

Question 28In herbivorous animals like cows, bacteria help in the digestion of ______.

Correct Answer: cellulose

Question 29Organisms that live on dead and decaying organic matter are called ______.

Correct Answer: saprophytes

Question 30The blackish cottony growth on stale bread is a fungus called ______.

Correct Answer: bread mould

Question 31The most common edible mushroom eaten practically all over the world is ______.

Correct Answer: Agaricus bisporous

Question 32Mushrooms can be grown on a substrate or ______ based on agricultural wastes.

Correct Answer: compost

Question 33The 'mushroom seed' consisting of a network of fibrous mass is called ______.

Correct Answer: mycelium

Question 34______ is the process of introducing mushroom mycelium into the compost.

Correct Answer: Spawning

Question 35Spreading a thin layer of soil over compost during mushroom cultivation is called ______.

Correct Answer: casing

Question 36The shelf life of mushrooms can be increased by exposing them to ______ radiation.

Correct Answer: gamma

Question 37All yeasts are ______ fungi belonging to the genus Saccharomyces.

Correct Answer: one-celled

Question 38Yeast cells are ______ in shape and contain a distinct cell wall and nucleus.

Correct Answer: ovoid

Question 39Yeast respires ______ in the absence of air, producing ethanol and carbon dioxide.

Correct Answer: anaerobically

Question 40Yeast reproduces asexually by a process called ______.

Correct Answer: budding

Question 41Sexual reproduction in yeast may occur by ______, where two cells unite and fuse.

Correct Answer: conjugation

Question 42Wine is usually made from grapes through the process of ______ fermentation.

Correct Answer: alcoholic

Question 43If bacteria enter a wine-making jar, they may turn the alcohol into ______.

Correct Answer: vinegar

Question 44The process of making beer from barley is known as ______.

Correct Answer: brewing

Question 45If alcohol concentration exceeds 13 to 14 percent, it ______ the yeast and stops fermentation.

Correct Answer: kills

Question 46To produce stronger alcoholic drinks like whisky or gin, the liquid must be ______.

Correct Answer: distilled

Question 47In bread making, the ______ gas produced by yeast makes the dough rise.

Correct Answer: carbon dioxide

Question 48The science of growing food crops and other useful crops is called ______.

Correct Answer: agriculture

Question 49Crops cultivated for commercial purposes, like rubber and tea, are called ______ crops.

Correct Answer: cash

Question 50Plants grown and harvested annually or seasonally for food are known as ______ plants.

Correct Answer: crop
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Short Answer Questions - Practice concise answers to these questions. Click "Show Answer" to reveal the response.
Question 1

What is the science of growing food crops and other useful plants called?

Answer:
Agriculture
Question 2

What are microorganisms also called?

Answer:
Microbes
Question 3

Who is considered the father of microbiology?

Answer:
Leeuwenhoek
Question 4

What is the study of microorganisms called?

Answer:
Microbiology
Question 5

Name the rod-shaped bacteria.

Answer:
Bacillus
Question 6

What is the shape of Coccus bacteria?

Answer:
Round
Question 7

What name is given to comma-shaped bacteria?

Answer:
Vibrio
Question 8

What are spring-shaped bacteria called?

Answer:
Spirillum
Question 9

What thread-like structure helps certain bacteria move?

Answer:
Flagellum
Question 10

What is the outermost slimy protective layer of a bacterial cell?

Answer:
Slime capsule
Question 11

What pH is generally favoured by most bacteria?

Answer:
7.4
Question 12

What are bacteria that flourish in the presence of oxygen called?

Answer:
Aerobes
Question 13

What are bacteria that do not require oxygen called?

Answer:
Obligate anaerobes
Question 14

What is the sugar found in milk called?

Answer:
Lactose
Question 15

Which bacterium is primarily used in curd making?

Answer:
Lactobacillus
Question 16

What acid is produced by bacteria during the formation of curd?

Answer:
Lactic acid
Question 17

What is the liquid separated from curd during cheese making called?

Answer:
Whey
Question 18

What is another name for cottage cheese at the processing stage?

Answer:
Curd
Question 19

Where are nitrogen-fixing bacteria found in leguminous plants?

Answer:
Root nodules
Question 20

Into what do nitrogen-fixing bacteria convert free nitrogen?

Answer:
Soluble nitrates
Question 21

Which bacteria help in the retting of jute fibres?

Answer:
Retting bacteria
Question 22

Which bacterium can decompose oil spills in marine water?

Answer:
Pseudomonas
Question 23

What gas used for cooking is produced from excreta by bacteria?

Answer:
Biogas
Question 24

What vitamin is synthesized by bacteria in the human intestine?

Answer:
Vitamin B
Question 25

What substance do bacteria help digest in cows and buffaloes?

Answer:
Cellulose
Question 26

Fungi lack which pigment necessary for photosynthesis?

Answer:
Chlorophyll
Question 27

What is the common name for the fungus Rhizopus?

Answer:
Bread mould
Question 28

What are organisms that live on rotten matter called?

Answer:
Saprophytes
Question 29

What is the scientific name of the common edible button mushroom?

Answer:
Agaricus bisporous
Question 30

What are mushrooms rich in?

Answer:
Proteins and minerals
Question 31

What is the first step in mushroom cultivation?

Answer:
Composting
Question 32

What is another term for 'mushroom seed'?

Answer:
Spawn
Question 33

What is the network of fibrous mass in mushrooms called?

Answer:
Mycelium
Question 34

What is the process of spreading soil over compost in mushroom farming?

Answer:
Casing
Question 35

To what radiation are mushrooms exposed for preservation?

Answer:
Gamma radiation
Question 36

Under which genus are most species of yeast classified?

Answer:
Saccharomyces
Question 37

How many cells does a yeast organism have?

Answer:
One
Question 38

What is the asexual mode of reproduction in yeast?

Answer:
Budding
Question 39

What are the end products of anaerobic respiration in yeast?

Answer:
Ethanol and CO2
Question 40

What is the property of yeast used in wine-making called?

Answer:
Alcoholic fermentation
Question 41

What is the process of making beer called?

Answer:
Brewing
Question 42

From which grain is beer primarily made?

Answer:
Barley
Question 43

What percentage of alcohol kills yeast during fermentation?

Answer:
13 to 14 percent
Question 44

What process is used to produce stronger alcoholic drinks like spirits?

Answer:
Distillation
Question 45

What gas causes bread dough to rise?

Answer:
Carbon dioxide
Question 46

What are crops grown for the production of food called?

Answer:
Food crops
Question 47

What are crops grown for commercial purposes called?

Answer:
Cash crops
Question 48

Is rubber a food crop or a cash crop?

Answer:
Cash crop
Question 49

What nutrients are cereals rich in?

Answer:
Carbohydrates
Question 50

What nutrients are pulses rich in?

Answer:
Proteins
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Long Answer Questions - Practice detailed answers to these comprehensive questions. Click "Show Answer" to reveal the response.
Question 1

What are microorganisms? Define the branch of science that deals with them and mention their general characteristics.

Answer:
Microorganisms, also known as microbes, are organisms that are extremely small in size and cannot be observed with the naked eye; they can only be seen under a microscope. The science which deals with the study of such organisms is called microbiology. General characteristics include: 1. Most are unicellular, such as bacteria, viruses, algae, fungi, and protozoans. 2. They are found everywhere, including air, water, soil, and food. 3. While many are harmful and cause diseases like cholera or malaria, some are highly useful to mankind in food production and industry.
Question 2

Describe the general structure of a bacterium with the help of its components.

Answer:
A bacterial cell is simple in structure and typically includes the following components: 1. Cell Wall: A rigid outer layer that surrounds the cell. 2. Primitive Nucleus: It contains chromatin fibres (single DNA strand coiled up) without a nuclear membrane. 3. Slime Capsule: An outermost slimy, gelatinous, protective layer found in some bacteria. 4. Cell Membrane: A thin membrane located below the cell wall. 5. Cytoplasm: The jelly-like substance within the membrane containing granules like glycogen. 6. Flagellum: A thread-like structure used by certain bacteria for movement.
Question 3

Discuss the environmental conditions required for the optimal growth of bacteria.

Answer:
Bacterial growth depends on the availability of adequate water and food, along with several influential external conditions: 1. pH: Most bacteria prefer slightly alkaline conditions (pH 7.4), though some tolerate extreme acidity or alkalinity. 2. Temperature: The range of 25-45 degrees Celsius is favourable for most. However, some grow at 0 degrees Celsius (relevant for food preservation) and others above 80 degrees Celsius. 3. Air and Oxygen: Aerobes flourish in air, facultative anaerobes can survive without it, and obligate anaerobes do not require oxygen at all.
Question 4

Explain the role of bacteria in the production of curd.

Answer:
Curd making is a traditional fermentation process involving whole milk. The process is as follows: 1. Bacteria like Lactobacillus bulgaricus and Streptococcus thermophilus act on the lactose (milk sugar). 2. These bacteria produce lactic acid, which reduces the pH of the milk. 3. The acid gives curd its sharp, tangy taste and reacts with milk proteins to create a smooth, thick texture. 4. Traditionally, a small amount of a previous batch (starter) is mixed with new milk to initiate fermentation.
Question 5

Detail the major steps involved in the manufacture of cheese.

Answer:
The manufacture of cheese involves four major steps: 1. Curdling: Lactic acid bacteria (Lactobacillus acidophilus) are added to milk to produce curd, which is then separated from the liquid whey. 2. Processing: The curd is processed to remove moisture; at this stage, it is known as cottage cheese. 3. Salting: Salt is added to further remove moisture and prevent the growth of undesirable microorganisms. 4. Ripening: The curd is kept at suitable temperature and humidity where added microorganisms impart a particular flavour.
Question 6

How do nitrogen-fixing bacteria contribute to soil fertility and agriculture?

Answer:
Nitrogen-fixing bacteria play a crucial role in agriculture: 1. They are found in the root nodules of leguminous plants like peas, grams, and pulses. 2. These bacteria take free nitrogen from the soil air and fix it into soluble nitrates. 3. These nitrates act as natural fertilizers, which plants can easily absorb to grow. 4. This process reduces the need for artificial chemical fertilizers and maintains soil health.
Question 7

Enumerate various industrial uses of bacteria other than food production.

Answer:
Bacteria have several industrial applications: 1. Tanning: Bacteria are used to treat animal skins and hides to remove flesh and make them soft. 2. Retting: Retting bacteria help in separating the fibres from the stems of plants like jute, flax, and hemp. 3. Decomposition of Hydrocarbons: Bacteria like Pseudomonas can break down oil spills in marine and fresh water. 4. Sewage Disposal: Bacteria help in the biological degradation of organic matter in sewage. 5. Biogas Production: Bacterial activity on human and animal excreta produces biogas used for cooking.
Question 8

Discuss the importance of bacteria in human and animal nutrition.

Answer:
Bacteria are essential for nutrition in many living beings: 1. In Humans: Many bacteria live in the human intestine where they synthesize certain B vitamins. 2. In Herbivores: In animals like cows and buffaloes, bacteria present in the digestive tract help in the digestion of cellulose, which the animals cannot digest on their own. 3. Symbiosis: These bacteria live in a mutually beneficial relationship with their hosts, aiding digestion while receiving food and shelter.
Question 9

What are fungi? Mention their nutrition type and provide examples of common fungi.

Answer:
Fungi are single-celled or multi-celled organisms that lack chlorophyll, meaning they cannot prepare their own food. Their characteristics include: 1. Nutrition: Most fungi are saprophytes, living on dead and decaying organic matter, thus acting as natural cleaners of the environment. 2. Bread Mould: A common type of fungus that appears as a blackish cottony growth on stale bread. 3. Mushroom: A white umbrella-like fungus that grows on decaying wood or garbage. 4. Yeast: A single-celled fungus used extensively in the baking and brewing industries.
Question 10

Explain the five major steps involved in the cultivation of white button mushrooms.

Answer:
The cultivation of Agaricus bisporous (white button mushroom) involves: 1. Composting: Preparing a mixture of wheat/paddy straw, chicken manure, and fertilizers, kept at 50 degrees Celsius for a week. 2. Spawning: Introducing 'mushroom seed' (mycelium) into the compost. 3. Casing: Spreading a thin layer of soil over the compost to provide support, humidity, and temperature regulation. 4. Cropping and Harvesting: Allowing growth through mycelium, pinhead, and button stages over 2-6 weeks, then taking out the full-grown mushrooms. 5. Preservation: Using vacuum cooling or gamma radiation to increase the shelf life of the perishable mushrooms.
Question 11

Describe the structure and occurrence of yeast.

Answer:
Yeast is a specialized type of fungus: 1. Structure: It is a one-celled, ovoid-shaped organism with a distinct cell wall, a nucleus, and one or more vacuoles in the cytoplasm. It can occur singly or in budding chains. 2. Occurrence: Yeasts are found freely in the atmosphere and grow readily in sugary solutions. They are commonly found on grapes, in flower nectar, and in sugarcane juice. 3. Genus: Several species fall under the genus Saccharomyces.
Question 12

Explain the process of respiration and reproduction in yeast.

Answer:
Yeast exhibits specific biological processes: 1. Respiration: Yeast respires anaerobically (without oxygen). It breaks down glucose into ethanol (alcohol) and carbon dioxide, releasing energy (ATP). The equation is C6H12O6 gives 2C2H5OH + 2CO2 + 2ATP. 2. Reproduction: It primarily reproduces asexually by budding, where a small bud forms, the nucleus divides, and the bud eventually separates. It can also reproduce sexually by conjugation, where two cells fuse to form spores that can be dispersed by wind.
Question 13

How is yeast utilized in the wine-making and brewing industries?

Answer:
Yeast is vital for alcoholic fermentation: 1. Wine Making: Grapes are crushed to extract juice containing sugar and wild yeast. The yeast ferments the sugar into alcohol. The flavour depends on the grape type and fermentation conditions. 2. Brewing (Beer): Barley grain is mashed with water, flavoured with hops, and then yeast is added to convert the malt sugar into alcohol. 3. Distillation: Since fermentation stops when alcohol reaches 13-14 percent (killing the yeast), distillation is used to produce stronger spirits like whisky, gin, and rum.
Question 14

Describe the role of yeast in the baking industry for making bread.

Answer:
The process of making bread using yeast involves: 1. Dough Preparation: Flour, water, sugar, and yeast are mixed to form dough. 2. Rising: The dough is left in a warm place for an hour. The yeast multiplies and ferments the sugar, giving off carbon dioxide gas. 3. Expansion: The gas causes the dough to rise and double in size. 4. Baking: When baked in a hot oven, the heat kills the yeast and evaporates the alcohol, resulting in a crisp, light loaf of bread.
Question 15

Define agriculture and differentiate between food crops and cash crops with examples.

Answer:
Agriculture is the science of growing food crops and other crops useful to mankind. Cultivated crops are divided into: 1. Food Crops: These are cultivated for the production of food for human consumption. Examples include cereals (rice, wheat), pulses (grams, peas), and oilseeds (mustard). 2. Cash Crops: These are cultivated for commercial purposes and industrial use rather than direct consumption as staple food. Examples include rubber, tea, coffee, spices, cotton, and jute.
Question 16

Classify crop plants based on their life-span and provide examples for each.

Answer:
Plants are classified into three categories based on life-span: 1. Annuals: Plants that complete their life cycle in one year or one season. Examples: Wheat, rice, beans, sunflower. 2. Biennials: Plants that live for two years or seasons. In the first year, they grow vegetative parts; in the second, they produce flowers and seeds. Examples: Radish, turnip, carrot (in temperate regions). 3. Perennials: Plants that live for more than two years and bear flowers and seeds every year. Examples: Mango, guava, rose, banyan, peepal.
Question 17

What is horticulture? List the different types of horticulture crops.

Answer:
Horticulture is the branch of agriculture that deals with the cultivation of vegetables, fruits, and decorative plants. Horticulture crops include: 1. Vegetables: Cabbage, cauliflower, spinach, tomato. 2. Fruits: Mango, grapes, apple, banana. 3. Decorative Plants: Crotons, coleus, ferns, bougainvillea. 4. Decorative Flowers: Rose, gladiolus, sunflower, jasmine.
Question 18

Compare Kharif and Rabi crops based on season, temperature, and examples.

Answer:
The two main crop seasons in India are: 1. Kharif Crops (Autumn crops): Raised in the rainy season (July to October). They require high temperatures and plenty of water. Example: Rice (paddy). 2. Rabi Crops (Winter crops): Grown in the winter season (October to March). They require cooler temperatures during growth and warm, sunny weather for ripening. Example: Wheat. 3. Soil/Rainfall: Rice needs flooded fields and 150-200 cm rainfall; wheat needs 50-100 cm rainfall and winter rains are beneficial.
Question 19

Explain the four methods of cultivation for Kharif crops like rice.

Answer:
The methods for cultivating rice include: 1. Broadcasting: Seeds are scattered or thrown over the soil by hand. 2. Dibbling: Seeds are dropped at regular intervals in furrows made by a plough. 3. Drilling: Seeds are sown through a hole in a bamboo shaft or iron tube into the furrow. 4. Transplantation: Seeds are first sown in nurseries. Healthy seedlings are then picked and manually transplanted into flooded regular fields. This ensures a better yield.
Question 20

What is organic farming and what techniques are used in it?

Answer:
Organic farming is the practice of raising crops without using inorganic chemical fertilizers, pesticides, or weedicides. Techniques include: 1. Use of organic manure prepared scientifically. 2. Crop rotation to maintain soil fertility naturally. 3. Hand weeding for weed control. 4. Mixed cropping to reduce pest risks. 5. Biological control of pests and diseases to avoid toxic chemical residues.
Question 21

Explain the 'Green Revolution' in India and the role of M.S. Swaminathan.

Answer:
The Green Revolution refers to the tremendous increase in the production of food grains, especially wheat, in India starting about 30 years ago. Key aspects include: 1. Use of high-yielding varieties (HYV) of seeds. 2. Modern irrigation systems and farm implements like tractors. 3. Increased use of fertilizers, weedicides, and pesticides. 4. Impact: Dr. M.S. Swaminathan played a pivotal role in developing and implementing these scientific practices, helping India move toward food self-sufficiency.
Question 22

Define animal husbandry and categorize livestock based on their utility.

Answer:
Animal husbandry is the branch of agriculture concerned with the breeding, feeding, and caring of livestock. Livestock are categorized as: 1. Milch Animals: Milk-yielding animals like cows and buffaloes. 2. Meat-providing Livestock: Animals reared for meat, such as sheep, goats, pigs, and poultry. 3. Draught Animals: Animals used for heavy work like ploughing and transport, such as bullocks and camels. 4. Others: Animals reared for silk (silk worms) or honey (bees).
Question 23

Differentiate between indigenous and exotic breeds of cows with examples.

Answer:
Cows are classified based on their origin: 1. Indigenous Breeds: Native to India. They are hardy and resistant to local diseases. Examples: Sahiwal (Punjab/Haryana), Gir (Gujarat), Red Sindhi. 2. Exotic Breeds: Imported from foreign countries. They generally have a longer lactation period and higher milk yield but are less resistant to local diseases. Examples: Jersey (Island of Jersey), Holstein-Friesian (Holland), Brown Swiss (Switzerland).
Question 24

What are the requirements for a good shelter for milch animals?

Answer:
A proper shelter for milch animals should have the following features: 1. It must be clean, dry, airy, and well-ventilated. 2. It should be spacious enough to avoid overcrowding. 3. The floor should be sloping to allow easy drainage of urine and waste. 4. It should protect animals from extreme weather conditions like rain, direct sunlight, and cold. 5. Proper arrangements for clean drinking water and feeding mangers should be present.
Question 25

Discuss the two types of cattle feed and their importance.

Answer:
Cattle feed consists of: 1. Roughage: Coarse and fibrous substance with low nutrient content, such as hay, green fodder, and silage. It provides bulk and aids digestion. 2. Concentrates: Nutrient-rich substances with very little fibre, including grains (maize, barley) and oil cakes (mustard, groundnut). They are rich in carbohydrates, proteins, and fats, and are essential during the lactation period to ensure high-quality milk production.
Question 26

Identify common cattle diseases and their causative agents.

Answer:
Cattle suffer from various diseases that require prevention and cure: 1. Foot and Mouth Disease: Caused by a virus; symptoms include blisters on feet and mouth. 2. Anthrax: Caused by bacteria; leads to high body temperature and swelling. 3. Rinderpest (Cattle Plague): Caused by bacteria; symptoms include loss of appetite and high fever. 4. Cow Pox: Caused by a virus; results in small nodules over the body. 5. Salmonellosis: Caused by bacteria; leads to diarrhea with blood clots.
Question 27

What are the common symptoms that indicate cattle are sick?

Answer:
Farmers can identify sick cattle by the following symptoms: 1. The animal stops feeding and appears inactive or tired. 2. The milk yield is significantly reduced. 3. Visible physical signs like drooping of lips and ears. 4. Changes in waste elimination, such as passing loose dung or coloured urine. 5. Abnormal body temperature, where the animal may feel very hot or start shivering.
Question 28

Define poultry and distinguish between eggers and broilers.

Answer:
Poultry refers to the rearing of birds like chickens, ducks, and turkeys for food. The two main types of chickens are: 1. Eggers (or Layers): These are egg-laying chickens reared specifically for egg production. Examples: White Leghorn. 2. Broilers: These are chickens reared specifically for obtaining meat. 3. Benefits: Poultry farming requires small investment, small area, and gives quick returns.
Question 29

Compare the indigenous and exotic breeds of poultry found in India.

Answer:
Poultry breeds include: 1. Indigenous Breed: The most popular is Aseel. It provides a high yield of meat but is not a good egg-layer. 2. Exotic Breeds: White Leghorn is very popular because it is small, requires less feed, and produces oval white eggs. Rhode Island Red is a dual-purpose breed, providing both good egg yield and quality meat. 3. Cross Breeds: Varieties like HH-260 and IBL-80 have been developed for improved performance.
Question 30

What are the essential practices for poultry care and what are the common poultry diseases?

Answer:
Poultry care involves: 1. Shelter: Keeping birds in wire cages or sheds to protect them from predators like cats and dogs. 2. Feed: Providing meshed cereals (bajra, wheat), rice bran, and 'fish meal' for nutrition. 3. Diseases: Birds are prone to Viral diseases (Fowl pox, Ranikhet), Bacterial diseases (Fowl cholera, Salmonellosis), and Fungal diseases (Aspergillosis). Proper sanitation and immunization are vital for health.
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Quick Review Flashcards - Click to flip and test your knowledge!
Question
What is the prime need of all living beings?
Answer
Food is the prime need of all living beings.
Question
Organisms that are extremely small in size and can only be seen under a microscope are called _____.
Answer
microorganisms
Question
What is the term for the study of microorganisms?
Answer
Microbiology.
Question
Who was the first person to describe bacteria found in pond water and saliva, and is known as the father of microbiology?
Answer
Leeuwenhoek.
Question
Name three examples of unicellular microorganisms.
Answer
Viruses, bacteria, and protozoans.
Question
What is the term for a round-shaped bacterium?
Answer
Coccus.
Question
What is the term for a rod-shaped bacterium?
Answer
Bacillus.
Question
What is the term for a spring-shaped bacterium?
Answer
Spirillum.
Question
A comma-shaped bacterium is known as _____.
Answer
vibrio
Question
What thread-like structure helps certain bacteria move?
Answer
Flagellum.
Question
What is the optimal pH range for most bacteria to grow?
Answer
Most bacteria are favoured by slightly alkaline conditions (pH 7.4).
Question
What is the optimal temperature range for most bacteria to grow?
Answer
The range of 25-45°C is favourable for most bacteria.
Question
What is the general term for using microorganisms to make end products that are useful to mankind?
Answer
Biotechnology.
Question
What are the two main species of bacteria used in the commercial process of making curd from milk?
Answer
Lactobacillus bulgaricus and Streptococcus thermophilus.
Question
In curd making, bacteria produce what acid that gives curd its sharp and tangy taste?
Answer
Lactic acid.
Question
Why is eating curd considered a "healthy" food, particularly for bone health?
Answer
It is high in calcium which is important for bone growth and prevention of osteoporosis.
Question
What is the first major step in the manufacture of cheese, which involves adding lactic acid bacteria to milk?
Answer
Curdling of milk.
Question
During cheese making, the curd produced is separated from the liquid ____.
Answer
whey
Question
The curd that is processed to remove moisture during cheese making is called _____.
Answer
cottage cheese
Question
What is the purpose of salting during the cheese-making process?
Answer
It further removes moisture and prevents the growth of undesirable micro-organisms.
Question
What is the final step in cheese making, where curd is kept at suitable temperature and humidity to impart a particular flavour?
Answer
Ripening.
Question
What is the function of nitrogen-fixing bacteria found in the root nodules of leguminous plants?
Answer
They fix free nitrogen of the soil into soluble nitrates which act as fertilisers.
Question
What genus of bacteria is capable of breaking down hydrocarbons in oil spills?
Answer
Pseudomonas.
Question
How do bacteria in the intestine of herbivores like cows and buffaloes help them?
Answer
They help in the digestion of cellulose.
Question
Fungi that live on dead and decaying organic matter are called ____.
Answer
saprophytes
Question
The blackish cottony growth on a stale piece of bread is a type of fungus called _____.
Answer
bread mould
Question
What is the scientific name for the most popular variety of edible mushroom grown in India?
Answer
Agaricus bisporus (white button mushroom).
Question
What is the term for mushroom cultivation that is done indoors and hence requires little land area?
Answer
Mushroom cultivation.
Question
Name two types of mushrooms, besides the white button mushroom, that are widely cultivated.
Answer
Paddy straw mushroom (Volvariella) and Oyster mushroom (Pleurotus).
Question
What is the first step in mushroom cultivation where a substrate is prepared from materials like wheat straw and chicken manure?
Answer
Composting.
Question
What is the second step in mushroom cultivation, where "mushroom seed" (mycelium) is introduced into the compost?
Answer
Spawning.
Question
What is the third step in mushroom cultivation, where a thin layer of soil is spread over the compost to provide support and humidity?
Answer
Casing.
Question
During mushroom cultivation, at what temperature should the arrangement be kept to prevent the growth of pests and diseases?
Answer
The temperature has to be kept low (20-25°C).
Question
What is the final step of mushroom cultivation, where the fully grown mushrooms are taken out?
Answer
Cropping and Harvesting.
Question
Name two processes used for the preservation of mushrooms.
Answer
Vacuum cooling and exposing them to gamma radiation before storing at 15°C.
Question
Yeasts are one-celled fungi that belong to which genus?
Answer
Saccharomyces.
Question
What is the chemical equation for the anaerobic respiration (fermentation) process in yeast?
Answer
$C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2 + 2ATP$ (glucose to ethanol and carbon dioxide).
Question
How does yeast primarily reproduce asexually?
Answer
By budding.
Question
What is the process of sexual reproduction in yeast where two cells unite and their contents fuse together?
Answer
Conjugation.
Question
Yeast's greatest economic importance is through its property of _____.
Answer
alcoholic fermentation
Question
What process is used to produce a stronger alcoholic drink after fermentation is complete?
Answer
Distillation.
Question
What gas, produced by yeast during fermentation, causes bread dough to rise?
Answer
Carbon dioxide.
Question
What is defined as the science of growing food crops and other useful plants to mankind?
Answer
Agriculture.
Question
Crops cultivated for the production of food are called _____ crops.
Answer
food
Question
Crops cultivated for commercial purposes, such as rubber, tea, and coffee, are called ____ crops.
Answer
cash
Question
What is the term for the cultivation of vegetables, fruits, and decorative plants?
Answer
Horticulture.
Question
The autumn crop, which is raised in the rainy season (July to October), is known as the _____ crop.
Answer
Kharif
Question
The winter crop, which is sown in October/Early November, is known as the ____ crop.
Answer
Rabi
Question
What is the most important Kharif crop in India?
Answer
Rice.
Question
What is the most important Rabi crop of India?
Answer
Wheat.
Question
What cultivation method for kharif crops involves throwing seeds over the soil?
Answer
Broadcasting.
Question
What cultivation method involves dropping seeds at regular intervals in furrows made by a plough?
Answer
Dibbling.
Question
What cultivation method involves sowing seeds inside a hole made in the soil with a bamboo shaft or iron tube?
Answer
Drilling.
Question
What cultivation method, used for crops like paddy rice, involves growing seedlings in a nursery before moving them to the main field?
Answer
Transplantation.
Question
Plants that complete their life cycle in one year or one season are called _____.
Answer
annuals
Question
Plants that live for two years or two seasons, typically flowering in the second year, are called _____.
Answer
biennials
Question
Plants which live for more than two years and bear flowers and seeds every year are called _____.
Answer
perennials
Question
What is the practice of raising crops without using inorganic fertilisers and pesticides called?
Answer
Organic farming.
Question
The tremendous increase in the production of the wheat crop in India during the last 30 years is called the _____.
Answer
Green revolution
Question
Which Indian scientist played a very important role in developing the green revolution in India?
Answer
M.S. Swaminathan.