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REPRODUCTION IN HUMANS - Q&A

REVIEW QUESTIONS

Multiple Choice Questions :

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

(a) The testes are located within the :

(i) Penis
(ii) Scrotum
(iii) Ureter
(iv) Urinary bladder
Answer: (ii) Scrotum
Explanation: As per page 29, testes lie outside the abdominal cavity in a sac called the scrotum to maintain a lower temperature required for sperm production.

(b) Amoeba most commonly reproduces by :

(i) Budding
(ii) Regeneration
(iii) Binary fission
(iv) Multiple fission
Answer: (iii) Binary fission
Explanation: As described on page 27, the most common method of reproduction in single-celled organisms like amoeba is Binary Fission (dividing into two).

(c) Identify the stage which is formed after the fertilisation of the egg by the sperm ?

(i) Ovule
(ii) Foetus
(iii) Embryo
(iv) Zygote
Answer: (iv) Zygote
Explanation: Page 28 states that after fertilisation of an ovum by a sperm, a cell called the zygote is formed.

(d) Internally, the uterus opens into :

(i) Urethra
(ii) Vagina
(iii) Oviduct
(iv) Vulva
Answer: (ii) Vagina
Explanation: According to page 28, the uterus leads to the outside through a muscular tube called the vagina.


Short Answer Questions :

1. Distinguish between the following pair of terms :

(a) Egg and sperm :

Answer:
1. Egg (Ovum): It is the female reproductive cell, usually larger, spherical, and non-motile (cannot move on its own). It contains stored food.
2. Sperm: It is the male reproductive cell, much smaller than the egg, and possesses a long tail for motility (movement). It is produced in large numbers.

(b) Sexual reproduction and asexual reproduction :

Answer:
1. Sexual Reproduction: Involves two parents (male and female). It requires the fusion of male and female gametes (sperm and egg) to form a zygote.
2. Asexual Reproduction: Involves only a single parent. No gametes are involved, and the offspring is produced by division or outgrowth of the parent body (e.g., binary fission, budding).

(c) Budding and regeneration :

Answer:
1. Budding: A form of asexual reproduction where a small outgrowth (bud) forms on the parent body, grows, and eventually detaches to become a new individual (e.g., in Hydra).
2. Regeneration: The ability of an organism to regrow lost or damaged body parts. In some animals like Hydra or Starfish, if the body is cut into pieces, each piece can regenerate into a new individual.


2. Define the following terms :

(a) Fertilization :

Answer: Fertilisation is the process of fusion of the male gamete (sperm) with the female gamete (ovum/egg) to form a zygote.

(b) Puberty :

Answer: Puberty is the period during which the reproductive systems of boys and girls mature, leading to the development of secondary sexual characteristics and the ability to reproduce. (It usually starts around age 12-13).

(c) Implantation :

Answer: Implantation is the natural process by which the developing embryo fixes itself into the wall of the uterus to establish pregnancy and continue development.


3. State the reason why the testes lie within the scrotum outside the abdomen ?

Answer: The testes lie outside the abdominal cavity in the scrotum because sperm development requires a temperature 2°C to 3°C lower than the normal body temperature. The scrotum acts as a thermoregulator to provide this suitable temperature.


4. Why is it important that a very large number of sperms should be present in the semen ?

Answer: A single ejaculation contains millions of sperms, but only a few are able to reach the upper parts of the oviducts. Many die on the way due to the acidic environment or physical barriers. A large number ensures that at least one sperm reaches and fertilises the egg.


5. List the structures, in their correct sequence, through which the sperms must pass from the time they are produced in the testes to the time they leave the urethra.

Answer: The correct sequence is:
Testes → Epididymis → Sperm duct (Vas deferens) → Urethra.


6. Given here is a section of the female reproductive system of human beings.

(a) Name the parts labelled 1 to 4

Answer:
1. Fallopian Tube (or Oviduct)
2. Ovary
3. Uterus (or Womb)
4. Vagina

(b) Name the part where fertilisation occurs in human beings.

Answer: Fertilisation occurs in the Fallopian Tube (Oviduct) (Part labelled 1).


7. State the functions of the following :

(a) Ovary :

Answer: Produces the female gametes (eggs or ova) and secretes female sex hormones.

(b) Testes :

Answer: Produce the male gametes (sperms) and secrete the male sex hormone (testosterone).

(c) Fallopian tubes :

Answer: Transport the egg from the ovary to the uterus; it is also the site where fertilisation of the egg by the sperm takes place.

(d) Seminal vesicles :

Answer: Produce a secretion which serves as a medium for the transportation of sperms and provides nutrition to them.

(e) Uterus :

Answer: Protects and nourishes the developing embryo/foetus until birth. It is where implantation occurs.


8. Given alongside is a diagram of reproductive system of the human male. Label the parts indicated by numbers 1 to 5, and state their functions.

Answer:
1. Sperm Duct (Vas Deferens): Carries sperms from the epididymis/testes to the urethra.
2. Seminal Vesicle: Secretes a fluid that activates sperms and provides a medium for their transport.
3. Penis: The organ that transfers sperms into the female's vagina during mating; it also contains the urethra for passing urine.
4. Testis: Produces sperms and male sex hormones.
5. Scrotum: Protects the testes and maintains the temperature lower than body temperature for sperm production.


Long Answer Questions (Write the answer in your notebook)

1. What is fertilization ? Describe the process in human beings.

Answer:
Definition: Fertilization is the fusion of a male gamete (sperm) with a female gamete (ovum) to form a zygote.
Process:
1. During sexual intercourse, semen containing millions of sperms is deposited in the vagina.
2. The sperms swim upwards through the uterus to the oviducts (fallopian tubes).
3. If an egg is present in the oviduct, many sperms approach it, but only one sperm penetrates the egg.
4. The tail of the sperm is left outside, and only the nucleus enters the egg.
5. The nucleus of the sperm fuses with the nucleus of the egg to form a single-celled zygote.


2. How does a single celled fertilized egg grows into an adult in human beings ?

Answer:
1. Zygote Formation: The process starts with a single-celled zygote formed by fertilization.
2. Cell Division: The zygote divides repeatedly to form a ball of numerous cells called the embryo.
3. Differentiation: As cells continue to divide, they begin to specialize (differentiation) to form different tissues and organs.
4. Foetus: Once the body parts (limbs, head, etc.) begin to form and become identifiable, the embryo is called a foetus.
5. Baby: After full gestation (about 280 days), the fully developed baby is born.
6. Growth to Adult: The baby grows through childhood and adolescence (puberty), where reproductive maturity is reached, eventually becoming an adult.


3. Tabulate the important physical changes in the boys and girls that take place during puberty.

Answer:

Boys Girls
1. Enlargement of testes. 1. Ovaries mature and release of eggs starts.
2. Penis and scrotal sac grow. 2. Uterus and vagina grow. Menstruation cycle starts.
3. Broad shoulders and wider chest (Shoulder girdle grows more than hip girdle). 3. Hips broaden and become wider (Hip girdle becomes trough shaped and bigger than shoulder girdle).
4. Growth of facial hair (beard, moustache) and body hair. 4. No facial hair. Growth of hair in armpits and pubic region.
5. Voice becomes deep and hoarse (low pitch). 5. Voice becomes shrill (high pitch). Breasts grow.


4. Describe the female reproductive system in human beings.

Answer:
The female reproductive system consists of the following main organs:
1. Ovaries: A pair of whitish oval bodies located in the lower abdomen. They produce eggs (ova) and female hormones.
2. Oviducts (Fallopian Tubes): Funnel-shaped tubes near the ovaries that carry the egg to the uterus. Fertilization usually happens here.
3. Uterus (Womb): A hollow, muscular, pear-shaped organ where the fertilized egg implants and grows into a baby.
4. Vagina: A muscular tube leading from the uterus to the outside. It receives sperms during mating and serves as the birth canal during delivery.

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

Question 1What is defined as the process of giving rise to new individuals of the same kind?

Correct Answer: Reproduction

Question 2Which of the following is a primary benefit of reproduction for a species?

Correct Answer: Continuance of the species

Question 3Which method of reproduction does NOT involve eggs or sperms?

Correct Answer: Asexual reproduction

Question 4In single-celled organisms like Amoeba, what is the most common method of reproduction?

Correct Answer: Binary fission

Question 5During binary fission in Amoeba, which part of the cell divides first?

Correct Answer: Nucleus

Question 6In Amoeba, the division of the nucleus is immediately followed by the division of what?

Correct Answer: The cytoplasm

Question 7Which multicellular animal is known to reproduce through budding?

Correct Answer: Hydra

Question 8What is the small growth on the outside of a parent body in asexual reproduction called?

Correct Answer: Bud

Question 9When do buds typically detach from the parent organism in Hydra?

Correct Answer: When they are big enough for independent existence

Question 10What is the process of regrowing missing or lost parts of the body called?

Correct Answer: Regeneration

Question 11Which animal besides Hydra is mentioned to have great powers of regeneration?

Correct Answer: Starfish

Question 12What happens if a Hydra is cut transversely into 2-3 pieces?

Correct Answer: Each piece regenerates into a new individual

Question 13In sexual reproduction, what are the special reproductive cells produced by males?

Correct Answer: Sperms

Question 14What is the female reproductive cell called?

Correct Answer: Egg or ovum

Question 15What is formed when a sperm and an egg fuse?

Correct Answer: Zygote

Question 16What is the specific name for the fusion of a sperm and an ovum?

Correct Answer: Fertilisation

Question 17Where are eggs produced in the human female reproductive system?

Correct Answer: Ovaries

Question 18What are the two whitish oval bodies in the female abdomen called?

Correct Answer: Ovaries

Question 19What is another name for the Fallopian tube?

Correct Answer: Oviduct

Question 20What is the function of the Fallopian tube (oviduct)?

Correct Answer: To provide a passage for the egg to the uterus

Question 21Where do the two oviducts open into?

Correct Answer: The uterus or womb

Question 22Which part of the female reproductive system is popularly known as the birth canal?

Correct Answer: Vagina

Question 23What is the neck of the uterus called?

Correct Answer: Cervix

Question 24Where are sperms produced in the human male reproductive system?

Correct Answer: Testes

Question 25Where are the testes located in the male body?

Correct Answer: In the scrotum outside the abdomen

Question 26Why are the testes located outside the abdominal cavity?

Correct Answer: To maintain a temperature 2-3°C lower than body temperature

Question 27What is the role of the epididymis?

Correct Answer: Leading sperm from the testes to the sperm duct

Question 28The sperm ducts open into which structure?

Correct Answer: The top of the urethra

Question 29What is the function of the secretion from the seminal vesicles?

Correct Answer: To serve as a medium for sperm transportation

Question 30What is the milky fluid called that is a mixture of sperm and glandular secretions?

Correct Answer: Semen

Question 31Which gland surrounds the base of the urethra and pours an alkaline secretion into the semen?

Correct Answer: Prostate gland

Question 32What is the primary function of the secretion from Cowper's glands?

Correct Answer: Lubrication

Question 33Which tube in males carries both urine and semen?

Correct Answer: Urethra

Question 34On average, how many sperms are contained in a single ejaculation?

Correct Answer: 20,000,000 to 40,000,000

Question 35During fertilisation, which part of the sperm penetrates the egg?

Correct Answer: The head (containing the nucleus)

Question 36How many sperms can fertilize a single egg?

Correct Answer: One

Question 37What happens to the tail of the sperm during fertilisation?

Correct Answer: It is left behind

Question 38Where does the zygote move to after it is formed in the oviduct?

Correct Answer: The uterus

Question 39What is the process of the embryo fixing itself into the wall of the uterus called?

Correct Answer: Implantation

Question 40Implantation leads to which biological state?

Correct Answer: Pregnancy

Question 41By the end of how many weeks of pregnancy is the human embryo considered to be in an advanced stage?

Correct Answer: Five weeks

Question 42Which systems are formed in the embryo by the end of five weeks of pregnancy?

Correct Answer: Heart and circulatory system

Question 43After how many months of pregnancy are the limbs of the foetus formed?

Correct Answer: Two months

Question 44What does 'growth' mean in the context of development?

Correct Answer: Irreversible increase in size and weight

Question 45What is the process where cells become specialized to form different body parts called?

Correct Answer: Differentiation

Question 46What is the term for the full term of development of an embryo in the uterus?

Correct Answer: Gestation

Question 47What is the average gestation period in humans?

Correct Answer: 280 days

Question 48During birth, which part of the baby usually emerges first?

Correct Answer: Head

Question 49What is the period during which reproductive systems mature in boys and girls?

Correct Answer: Puberty

Question 50At what age does puberty typically start in girls?

Correct Answer: 12 years
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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 1Reproduction is the process of giving rise to new individuals of the same kind.

Correct Answer: True

Statement 2Reproduction helps in the continuance of the species.

Correct Answer: True

Statement 3Amoeba is a multicellular organism.

Correct Answer: False

Statement 4Asexual reproduction involves the fusion of eggs and sperms.

Correct Answer: False

Statement 5Hydra can reproduce by producing small buds.

Correct Answer: True

Statement 6Sexual reproduction involves two sexes: males and females.

Correct Answer: True

Statement 7Sperms and eggs fuse to form a zygote.

Correct Answer: True

Statement 8Binary fission is common in single-celled organisms like Paramecium.

Correct Answer: True

Statement 9In binary fission, the cytoplasm divides before the nucleus.

Correct Answer: False

Statement 10The two offspring resulting from binary fission live as new individuals.

Correct Answer: True

Statement 11Budding is a process where buds grow on the inside of the parent body.

Correct Answer: False

Statement 12Hydra buds detach themselves when they are big enough for independent existence.

Correct Answer: True

Statement 13Regeneration is the process of regrowing lost or missing body parts.

Correct Answer: True

Statement 14Starfish do not have the power of regeneration.

Correct Answer: False

Statement 15A Hydra cut into pieces can give rise to new individuals from each piece.

Correct Answer: True

Statement 16Most animals reproduce asexually.

Correct Answer: False

Statement 17The male reproductive cell is called the ovum.

Correct Answer: False

Statement 18The fusion of a sperm and an ovum is called fertilisation.

Correct Answer: True

Statement 19A zygote eventually gives rise to an adult organism.

Correct Answer: True

Statement 20The female eggs are produced in the ovaries.

Correct Answer: True

Statement 21Ovaries are located in the upper half of the abdomen.

Correct Answer: False

Statement 22The Fallopian tube is also known as the oviduct.

Correct Answer: True

Statement 23Eggs are released from the ovary into the oviduct.

Correct Answer: True

Statement 24The two oviducts open into the vagina directly.

Correct Answer: False

Statement 25The uterus is also known as the womb.

Correct Answer: True

Statement 26The vagina is popularly known as the birth canal.

Correct Answer: True

Statement 27The cervix is the neck of the uterus.

Correct Answer: True

Statement 28The human male produces sperms in the testes.

Correct Answer: True

Statement 29The testes are located inside the abdominal cavity in humans.

Correct Answer: False

Statement 30The scrotum helps keep the testes at a temperature lower than the body.

Correct Answer: True

Statement 31A temperature 2-3°C lower than the body is suitable for sperm development.

Correct Answer: True

Statement 32Sperm ducts lead into the epididymis.

Correct Answer: False

Statement 33The seminal vesicles produce secretion for sperm transportation.

Correct Answer: True

Statement 34Semen is a mixture of sperms and glandular fluids.

Correct Answer: True

Statement 35The prostate gland pours an acidic secretion into the semen.

Correct Answer: False

Statement 36Cowper's glands provide lubrication for the semen.

Correct Answer: True

Statement 37The male urethra carries both urine and semen.

Correct Answer: True

Statement 38A single ejaculation contains roughly 200 sperms.

Correct Answer: False

Statement 39The sperm's tail helps it swim toward the ovum.

Correct Answer: True

Statement 40Only the tail part of the sperm penetrates the egg during fusion.

Correct Answer: False

Statement 41Fertilisation usually occurs in the uterus.

Correct Answer: False

Statement 42Implantation is the fixing of the embryo in the uterine wall.

Correct Answer: True

Statement 43Pregnancy begins once implantation is successful.

Correct Answer: True

Statement 44An embryo's heart is formed by the end of five weeks.

Correct Answer: True

Statement 45Foetal limbs are formed after the sixth month of pregnancy.

Correct Answer: False

Statement 46Growth is defined as a reversible increase in size and weight.

Correct Answer: False

Statement 47A single-celled zygote divides to form a cluster of cells.

Correct Answer: True

Statement 48Specialisation of cells into tissues is called differentiation.

Correct Answer: True

Statement 49Gestation is the full term of embryo development in the uterus.

Correct Answer: True

Statement 50Human gestation lasts for about 180 days.

Correct Answer: False
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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 1Reproduction is the process of giving rise to new individuals of the ______ kind.

Correct Answer: same

Question 2Single-celled organisms like amoeba reproduce simply by ______ into two.

Correct Answer: dividing

Question 3Methods of reproduction that do not involve eggs or sperms are called ______ methods.

Correct Answer: asexual

Question 4In sexual reproduction, males and females produce special types of reproductive cells called ______.

Correct Answer: gametes

Question 5The fusion of a sperm and an egg forms a ______.

Correct Answer: zygote

Question 6Binary fission is the most common method of reproduction in ______ organisms.

Correct Answer: single-celled

Question 7In amoeba, the ______ divides into two first during binary fission.

Correct Answer: nucleus

Question 8Following the division of the nucleus in amoeba, the ______ divides to form two daughter cells.

Correct Answer: cytoplasm

Question 9______ is a process in which buds grow on the outside of the parent body.

Correct Answer: Budding

Question 10Budding is a common method of reproduction in the multicellular animal ______.

Correct Answer: Hydra

Question 11Buds in Hydra ______ themselves when they are big enough for independent existence.

Correct Answer: detach

Question 12The process of regrowing missing or lost parts of the body is called ______.

Correct Answer: regeneration

Question 13Besides Hydra, the ______ is another animal mentioned that has a great power of regeneration.

Correct Answer: starfish

Question 14If a Hydra is cut ______ into 2-3 pieces, each piece will regenerate into a new individual.

Correct Answer: transversely

Question 15Special reproductive cells in males are called ______.

Correct Answer: sperms

Question 16Special reproductive cells in females are called ______.

Correct Answer: eggs

Question 17The process of fusion between a sperm and an ovum is called ______.

Correct Answer: fertilisation

Question 18In the human female, eggs are produced in the ______.

Correct Answer: ovaries

Question 19The ovaries are two whitish ______ bodies lying in the lower abdomen.

Correct Answer: oval

Question 20The funnel-shaped tube close to each ovary is called the ______.

Correct Answer: oviduct

Question 21The oviduct is also commonly known as the ______.

Correct Answer: Fallopian tube

Question 22The two oviducts open into a muscular organ called the ______.

Correct Answer: uterus

Question 23The uterus is also popularly known as the ______.

Correct Answer: womb

Question 24The uterus leads to the outside through a muscular tube called the ______.

Correct Answer: vagina

Question 25The vagina is popularly known as the ______ canal.

Correct Answer: birth

Question 26The neck of the uterus is called the ______.

Correct Answer: cervix

Question 27In females, the ______ from the urinary bladder opens into the vulva.

Correct Answer: urethra

Question 28Human sperms are produced in the ______.

Correct Answer: testes

Question 29The testes lie outside the abdominal cavity in a sac called the ______.

Correct Answer: scrotum

Question 30Testes are kept at a temperature ______ degrees Celsius lower than the body temperature.

Correct Answer: 2-3

Question 31The lower temperature in the scrotum is suitable for sperm ______.

Correct Answer: development

Question 32Sperm-producing tubes in the testes join to form the ______.

Correct Answer: epididymis

Question 33The epididymis leads into a muscular ______.

Correct Answer: sperm duct

Question 34The sperm ducts open at the top of the ______.

Correct Answer: urethra

Question 35The ______ are a pair of lobulated glands that provide a transport medium for sperms.

Correct Answer: seminal vesicles

Question 36The mixture of sperms and glandular fluids is a milky fluid called ______.

Correct Answer: semen

Question 37The base of the male urethra is surrounded by the ______ gland.

Correct Answer: prostate

Question 38The prostate gland pours an ______ secretion into the semen.

Correct Answer: alkaline

Question 39Two small ovoid glands that provide lubrication are called ______ glands.

Correct Answer: Cowper's

Question 40The male ______ carries either urine or semen to the outside of the body.

Correct Answer: urethra

Question 41A single ejaculation of semen contains approximately ______ to 40,000,000 sperms.

Correct Answer: 20,000,000

Question 42The sperm uses its ______ to swim upward in the female reproductive tract.

Correct Answer: tail

Question 43During fertilisation, only the ______ part of the sperm penetrates the egg.

Correct Answer: head

Question 44The zygote grows by ______ division to produce an embryo.

Correct Answer: cell

Question 45The fixing of the embryo in the wall of the uterus is called ______.

Correct Answer: implantation

Question 46Implantation of the embryo produces the state of ______.

Correct Answer: pregnancy

Question 47By the end of ______ weeks of pregnancy, the embryo's heart and circulatory system are formed.

Correct Answer: five

Question 48The ______ of the foetus are formed after two months of pregnancy.

Correct Answer: limbs

Question 49The ______ increase in size and weight of an individual is known as growth.

Correct Answer: irreversible

Question 50The process of cell specialisation leading to different body parts is called ______.

Correct Answer: differentiation
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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 process of giving rise to new individuals of the same kind called?

Answer:
Reproduction
Question 2

Which method of reproduction does not involve eggs or sperms?

Answer:
Asexual reproduction
Question 3

What is the fusion of a sperm and an egg called?

Answer:
Fertilisation
Question 4

What cell is formed immediately after fertilisation?

Answer:
Zygote
Question 5

Which single-celled organism reproduces by binary fission?

Answer:
Amoeba
Question 6

Which part of the cell divides first during binary fission in Amoeba?

Answer:
Nucleus
Question 7

What is the common method of reproduction in Hydra?

Answer:
Budding
Question 8

What are the small growths on the outside of a parent body in Hydra called?

Answer:
Buds
Question 9

What is the ability to regrow lost or missing body parts called?

Answer:
Regeneration
Question 10

Name a multicellular animal besides Hydra that shows regeneration.

Answer:
Starfish
Question 11

What are the male reproductive cells in humans called?

Answer:
Sperms
Question 12

What are the female reproductive cells in humans called?

Answer:
Eggs or ova
Question 13

Where are eggs produced in the human female?

Answer:
Ovaries
Question 14

What is the scientific name for Fallopian tubes?

Answer:
Oviducts
Question 15

Where does a fertilised egg develop in the human female?

Answer:
Uterus
Question 16

What is the common name for the uterus?

Answer:
Womb
Question 17

What is the muscular tube leading to the outside of the female body called?

Answer:
Vagina
Question 18

Which organ is popularly known as the birth canal?

Answer:
Vagina
Question 19

What is the neck of the uterus called?

Answer:
Cervix
Question 20

Where are sperms produced in the human male?

Answer:
Testes
Question 21

In which sac are the testes located?

Answer:
Scrotum
Question 22

How many degrees lower than body temperature are the testes kept?

Answer:
2-3°C
Question 23

What structure leads from the testes to the sperm duct?

Answer:
Epididymis
Question 24

What is the milky fluid containing sperms called?

Answer:
Semen
Question 25

Which gland surrounds the base of the male urethra?

Answer:
Prostate gland
Question 26

What is the function of the secretion from Cowper's glands?

Answer:
Lubrication
Question 27

Which tube in males carries both urine and semen?

Answer:
Urethra
Question 28

What is the average number of sperms in a single ejaculation?

Answer:
20-40 million
Question 29

Which part of the sperm contains the nucleus?

Answer:
Head
Question 30

What part of the sperm is left behind during fertilisation?

Answer:
Tail
Question 31

What is the fixing of the embryo in the uterine wall called?

Answer:
Implantation
Question 32

What state is produced by the implantation of an embryo?

Answer:
Pregnancy
Question 33

When does the heart and circulatory system form in an embryo?

Answer:
Five weeks
Question 34

After how many months are the limbs of a foetus formed?

Answer:
Two months
Question 35

What is the irreversible increase in size and weight called?

Answer:
Growth
Question 36

What is the specialisation of cells into different body parts called?

Answer:
Differentiation
Question 37

What is the full term of embryo development in the uterus called?

Answer:
Gestation
Question 38

What is the average gestation period in humans?

Answer:
280 days
Question 39

What is the period of reproductive maturation called?

Answer:
Puberty
Question 40

At what age does puberty typically start in girls?

Answer:
Twelve
Question 41

At what age does puberty typically start in boys?

Answer:
Thirteen
Question 42

What is the first sign of puberty in girls?

Answer:
Breast development
Question 43

What is the first sign of puberty in boys?

Answer:
Testes enlargement
Question 44

What cycle starts in girls during puberty?

Answer:
Menstruation
Question 45

What age range defines adolescence?

Answer:
10-19 years
Question 46

What is another name for adolescents?

Answer:
Teenagers
Question 47

What percentage of height is gained during adolescence?

Answer:
25%
Question 48

What percentage of weight is gained during adolescence?

Answer:
50%
Question 49

What stage follows adolescence?

Answer:
Adulthood
Question 50

Which girdle in girls becomes trough-shaped during puberty?

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

Define reproduction and explain its significance for the survival of a species.

Answer:
Reproduction is the biological process by which living organisms give rise to new individuals of the same kind. Its primary significance includes: 1. Continuance of the species: It ensures that a particular species does not become extinct. 2. Maintenance of Population: It helps in maintaining the number of individuals in a population. 3. Transfer of Genetic Information: In sexual reproduction, it allows for the transfer and mixing of genetic material, which can lead to variation and evolution.
Question 2

Distinguish between asexual and sexual reproduction with examples.

Answer:
Asexual Reproduction: 1. It involves only one parent. 2. No special reproductive cells (eggs or sperms) are involved. 3. Offspring are generally identical to the parent. Example: Amoeba (binary fission), Hydra (budding). Sexual Reproduction: 1. It involves two parents (male and female). 2. It involves the fusion of special reproductive cells called gametes (sperm and egg). 3. Offspring show variations. Example: Humans, most mammals.
Question 3

Describe the process of binary fission in Amoeba with the help of steps.

Answer:
Binary fission is the most common method of reproduction in single-celled organisms like Amoeba. The process involves: 1. Nuclear Division: The nucleus of the parent Amoeba first elongates and divides into two daughter nuclei. 2. Cytoplasmic Division: This is followed by the division of the cytoplasm. 3. Separation: The cell membrane constricts, and eventually, the two offspring separate to live as independent new individuals called daughter amoebae.
Question 4

What is budding? Explain how it occurs in Hydra.

Answer:
Budding is an asexual method where a new organism grows from an outgrowth or bud on the parent's body. In Hydra: 1. A small bud grows on the outside of the parent Hydra's body. 2. This bud gradually grows in size and develops tentacles and a mouth. 3. Once the bud is large enough for independent existence, it detaches itself from the parent body to live as a new individual.
Question 5

Explain the concept of regeneration and provide an example of how it acts as a reproductive method.

Answer:
Regeneration is the process of regrowing lost or missing parts of the body. In some animals, it serves as a method of reproduction. For example, in Hydra: 1. If a Hydra is cut transversely into 2-3 pieces, each piece has the power to grow back the missing parts. 2. Eventually, each piece gives rise to a complete new individual. This power of regrowth is also found in animals like Starfish.
Question 6

Describe the structure and function of the human ovaries.

Answer:
Ovaries are the primary female reproductive organs. 1. Structure: They are two whitish, oval-shaped bodies located in the lower half of the abdomen, one on each side of the uterus. 2. Function: The primary function of the ovaries is to produce female gametes, called eggs or ova. They also produce female sex hormones.
Question 7

What are Fallopian tubes? State their role in the female reproductive system.

Answer:
Fallopian tubes, also known as oviducts, are expanded, funnel-shaped tubes located close to each ovary. Their roles include: 1. Egg Transport: When an egg is released from the ovary, it passes down through this tube. 2. Site of Fertilisation: In humans, the fusion of the sperm and the egg (fertilisation) typically occurs within the Fallopian tube. 3. Path to Uterus: They connect the ovaries to the uterus, allowing the zygote to travel to the womb.
Question 8

Define the uterus and explain its role in pregnancy.

Answer:
The uterus, or womb, is a muscular organ in the female reproductive system where the two oviducts open. 1. Function: It is designed to house and nourish a developing foetus. 2. Implantation: The fertilised egg (embryo) attaches itself to the muscular wall of the uterus in a process called implantation. 3. Growth: It expands significantly during pregnancy to accommodate the growing baby. 4. Birth: Its powerful muscular walls contract during labor to push the baby out through the vagina.
Question 9

Describe the location and function of the testes in the human male.

Answer:
The testes are the primary male reproductive organs. 1. Location: They are a pair of oval bodies located outside the abdominal cavity in a sac called the scrotum. 2. Function: Their primary function is to produce male gametes, called sperms. 3. Temperature Regulation: Being outside the body allows them to stay 2-3°C cooler than the internal body temperature, which is necessary for healthy sperm development.
Question 10

Why are the testes located in the scrotum outside the abdomen?

Answer:
The testes are located in the scrotum outside the abdomen because the production and development of sperms require a temperature that is lower than the normal internal body temperature. By being in the scrotal sac, the testes are maintained at a temperature approximately 2-3°C lower than the rest of the body, which is the most suitable environment for sperm production.
Question 11

Trace the path of sperm from production to ejaculation.

Answer:
The sequence of structures through which sperm passes is: 1. Testes: Where sperms are produced in sperm-producing tubes. 2. Epididymis: A mass of tubes where sperms are stored and matured. 3. Sperm Duct (Vas Deferens): Muscular tubes that carry sperm upward toward the urethra. 4. Urethra: The common passage for both urine and semen, passing through the penis to the outside of the body.
Question 12

What is semen? Name the glands that contribute to its formation.

Answer:
Semen is a milky white fluid that acts as a transport medium for sperms. It is a mixture of sperms and secretions from the following glands: 1. Seminal Vesicles: Provide a medium for transportation. 2. Prostate Gland: Pours an alkaline secretion into the semen to neutralize acidity. 3. Cowper’s Glands: Produce a secretion that serves as a lubricant.
Question 13

Compare the structure of a human sperm and a human egg.

Answer:
Human Sperm: 1. Size: Very small (head approx. 0.01 mm). 2. Structure: Consists of a head (containing the nucleus) and a long tail for swimming. 3. Motility: Highly motile. Human Egg (Ovum): 1. Size: Much larger than sperm (approx. 0.05 mm). 2. Structure: Rounded cell with a nucleus, cytoplasm, and a cell membrane. 3. Motility: Non-motile; moved by the cilia in the oviduct.
Question 14

Explain the process of fertilisation in humans.

Answer:
Fertilisation is the fusion of a male gamete with a female gamete. 1. Interaction: Sperms deposited in the vagina swim up through the uterus into the oviducts. 2. Entry: If an egg is present, one sperm penetrates the egg. 3. Fusion: The tail of the sperm is left behind; the head enters the egg, and the nucleus of the sperm fuses with the nucleus of the egg. 4. Result: This fusion forms a single-celled zygote.
Question 15

What is implantation and what is its result?

Answer:
Implantation is the process where a developing embryo attaches itself to the wall of the uterus. 1. Process: After fertilisation in the oviduct, the zygote divides to form a ball of cells (embryo). As it reaches the uterus, it forms a pit in the uterine wall and gets fixed in it. 2. Result: Successful implantation produces the state of pregnancy.
Question 16

Define gestation and state its duration in humans.

Answer:
Gestation is the full term of development of the embryo/foetus inside the uterus, from fertilisation until birth. In humans, the gestation period lasts for approximately 280 days (or about 9 months).
Question 17

Describe the developmental changes in the embryo during the first two months of pregnancy.

Answer:
During the early stages of pregnancy: 1. First 5 Weeks: The embryo is in an advanced stage where the heart and circulatory system are formed. 2. After 2 Months: The limbs (arms and legs) start to form. The embryo begins to take on a more human appearance and is often referred to as a foetus.
Question 18

What is differentiation in the context of growth and development?

Answer:
Differentiation is the process that accompanies cell division where cells become specialized. 1. Specialization: Cells in the growing embryo change to perform specific functions. 2. Formation: This leads to the formation of different tissues, organs, and organ systems. 3. Result: It transforms a simple cluster of cells into a complex organism with distinct body parts.
Question 19

Explain the process of birth (parturition) in humans.

Answer:
At the end of the gestation period: 1. Contractions: The powerful muscles of the uterus begin to contract. 2. Passage: These contractions push the baby downward. 3. Delivery: The baby is pushed out through the vagina (birth canal). 4. Orientation: Usually, the baby's head emerges first.
Question 20

Define puberty and state the average age it begins in boys and girls.

Answer:
Puberty is the period during which the reproductive systems of boys and girls mature, and they become capable of reproduction. 1. In Girls: It typically starts around the age of 12. 2. In Boys: It typically starts around the age of 13.
Question 21

List four physical changes that occur in girls during puberty.

Answer:
Four physical changes in girls during puberty include: 1. Development and enlargement of breasts. 2. Maturation of ovaries and the start of the menstruation cycle (release of eggs). 3. Growth of the uterus and vagina. 4. Widening of the hip girdle, which becomes bigger than the shoulder girdle.
Question 22

List four physical changes that occur in boys during puberty.

Answer:
Four physical changes in boys during puberty include: 1. Enlargement of the testes and growth of the penis/scrotal sac. 2. Growth of facial hair (beards and moustaches) and hair on the chest. 3. Deepening of the voice, which becomes hoarse or low-pitched. 4. Broadening of the shoulders, with the shoulder girdle growing more than the hip girdle.
Question 23

What is adolescence? Why are adolescents called 'teenagers'?

Answer:
Adolescence is the period of life between 10-19 years of age, marked by rapid physical, emotional, and psychological growth. Adolescents are called 'teenagers' because this period covers the years that end in 'teen' (thirteen, fourteen, up to nineteen).
Question 24

Describe the psychological changes that occur during adolescence.

Answer:
During adolescence, individuals experience significant psychological and emotional changes, including: 1. Increased self-awareness and self-consciousness. 2. A spurt in emotional growth and changing moods. 3. Development of more complex thinking and intellectual interests. 4. A transition toward social and emotional independence.
Question 25

Explain the characteristics of the adulthood stage of human life.

Answer:
Adulthood follows adolescence and is characterized by: 1. Physical Maturity: The individual has attained full physical growth. 2. Emotional Stability: A greater sense of emotional balance compared to adolescence. 3. Responsibility: Focus on stable relationships, intellectual pursuits, and career goals. 4. Vision: Grounded values and a strong vision for the future dominate this stage.
Question 26

What is the difference between binary fission and multiple fission?

Answer:
1. Binary Fission: The parent organism divides into exactly two daughter individuals (e.g., Amoeba). 2. Multiple Fission: The parent organism divides into many daughter individuals simultaneously. While the text primarily details binary fission in Amoeba, it notes that fission can be either binary or multiple depending on the organism.
Question 27

Explain the importance of the alkaline secretion from the prostate gland.

Answer:
The prostate gland pours an alkaline secretion into the semen. This is important because: 1. Neutralization: It helps neutralize the acidity of the male urethra (caused by urine) and the female vaginal tract. 2. Sperm Survival: Sperms are sensitive to acidic environments; the alkaline fluid ensures their survival and motility during their journey to the egg.
Question 28

What happens to the zygote as it moves from the Fallopian tube to the uterus?

Answer:
As the zygote moves toward the uterus: 1. Cell Division: It begins to divide rapidly through mitosis. 2. Embryo Formation: By the time it reaches the uterus, it has transformed into a small ball consisting of numerous cells. 3. Preparation: It is now ready to undergo implantation into the uterine wall.
Question 29

Describe the function of the vagina in the female reproductive system.

Answer:
The vagina serves several critical functions: 1. Reception: It receives the penis and semen during sexual intercourse. 2. Birth Canal: It serves as the passage through which the baby is pushed out during birth. 3. Menstrual Flow: It provides a passage for the menstrual blood to leave the body.
Question 30

How does the diet or health of the mother affect the gestation period?

Answer:
While the text focuses on the biological timeline (280 days), the gestation period involves the embryo forming various tissues and organs (heart, limbs, etc.). A healthy environment is crucial because the embryo depends entirely on the mother for nutrients and oxygen to complete these complex developmental milestones like differentiation and organ system formation.
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Quick Review Flashcards - Click to flip and test your knowledge!
Question
What is the biological process of giving rise to new individuals of the same kind?
Answer
Reproduction.
Question
Which mode of reproduction involves only a single parent and does not involve eggs or sperms?
Answer
Asexual reproduction.
Question
Which mode of reproduction involves two sexes, male and female, who produce special types of reproductive cells?
Answer
Sexual reproduction.
Question
What is the most common method of reproduction in single-celled organisms like amoeba and paramecium?
Answer
Fission (Binary or multiple fission).
Question
In the process of binary fission in an Amoeba, the _____ divides first, followed by the division of the cytoplasm.
Answer
nucleus
Question
What is the process in which buds grow on the outside of the parent body and eventually detach to live as independent individuals?
Answer
Budding.
Question
Which organism is commonly cited as an example of reproduction through budding?
Answer
Hydra.
Question
What is the term for the great power of animals like Hydra and starfish to regrow missing or lost parts of their body?
Answer
Regeneration.
Question
The special types of reproductive cells produced during sexual reproduction are called _____ in males and _____ in females.
Answer
sperms; eggs
Question
What is the process of fusion between a sperm and an ovum called?
Answer
Fertilisation.
Question
What is the cell called that is formed after the fertilisation of an ovum by a sperm?
Answer
Zygote.
Question
The zygote grows by cell division and develops into an _____, which eventually becomes a new individual.
Answer
embryo
Question
In the female reproductive system, what are the two whitish oval bodies that produce the eggs?
Answer
Ovaries.
Question
What is the expanded, funnel-shaped tube close to each ovary through which a released egg passes down?
Answer
Oviduct or fallopian tube.
Question
In which part of the female reproductive system does fertilisation typically occur?
Answer
The oviduct (fallopian tube).
Question
What is the name of the organ, also called the womb, where the embryo develops?
Answer
Uterus.
Question
The uterus leads to the outside through which muscular tube, also known as the birth canal?
Answer
Vagina.
Question
In the male reproductive system, where are the sperms produced?
Answer
Testes.
Question
Why are the testes located in a sac called the scrotum, outside the abdominal cavity?
Answer
To maintain a temperature 2–3°C lower than the body's, which is suitable for sperm development.
Question
What is the name for the mass of sperm-producing tubes that includes the epididymis?
Answer
Testes.
Question
Sperms pass from the testes through the _____ into muscular sperm ducts.
Answer
epididymis
Question
What is the function of the seminal vesicles in the male reproductive system?
Answer
They produce a secretion which serves as a medium for the transportation of the sperms.
Question
What is the composition of semen?
Answer
A mixture of sperms and secretions from the seminal vesicles, prostate, and Cowper's glands.
Question
What is the function of the alkaline secretion from the prostate gland?
Answer
It is added to the semen as it passes through the urethra to neutralize acidity.
Question
The secretion of which glands serves as a lubricant in the male reproductive system?
Answer
Cowper's glands.
Question
Which tube in the human male passes either urine or semen?
Answer
Urethra.
Question
During fertilisation in humans, what part of the sperm penetrates into the egg?
Answer
Only the head part (which contains the nucleus).
Question
What is the process called where the developing embryo fixes itself in the wall of the uterus?
Answer
Implantation.
Question
At the time of implantation, the embryo is described as a small ball of _____ cells.
Answer
numerous
Question
After five weeks of pregnancy, the embryo enters an advanced stage where the _____ and _____ system are formed.
Answer
heart; circulatory
Question
What is the term for any type of irreversible increase in the size and weight of an individual during the process of development?
Answer
Growth.
Question
The specialisation of cells to form different parts of the body, giving rise to various tissues and organs, is known as _____.
Answer
differentiation
Question
What is the term for the full term of development of an embryo in the uterus, which lasts for about 280 days in humans?
Answer
Gestation.
Question
What is the term for the period during development when the reproductive systems of boys and girls mature?
Answer
Puberty.
Question
In girls, puberty starts at the age of about _____, while in boys, it starts at about thirteen years of age.
Answer
twelve
Question
What is considered the first sign of puberty in boys?
Answer
The enlargement of the testes.
Question
During puberty in boys, the _____ girdle grows more than the hip girdle.
Answer
shoulder
Question
What change happens to the voice of boys during puberty?
Answer
It becomes deep and hoarse (a low pitch voice).
Question
What is one of the first signs of puberty in girls, involving the reproductive organs?
Answer
Ovaries mature and the release of eggs starts.
Question
During puberty in girls, the _____ becomes broader and larger than the shoulder girdle.
Answer
hip girdle
Question
The start of which cyclical event, involving bleeding, is a key sign of puberty in girls?
Answer
Menstruation cycle.
Question
What change happens to the voice of girls during puberty?
Answer
It becomes a high pitch voice.
Question
What is the period between 10-19 years of age in an individual's life called?
Answer
Adolescence.
Question
What is another common name for individuals in the period of adolescence?
Answer
Teenagers.
Question
Adolescence may begin a year or two _____ in girls than in boys.
Answer
earlier
Question
Which stage of life follows adolescence and is characterized by full physical growth and emotional stability?
Answer
Adulthood.
Question
In Amoeba, reproduction results in the division of the parent amoeba into two ____ amoebae.
Answer
daughter
Question
Which two animals are given as examples that have a great power to regenerate?
Answer
Hydra and starfish.
Question
The ovaries are located within the lower half of the _____, one on each side of the uterus.
Answer
abdomen
Question
A pair of testes lies outside the abdominal cavity in a sac called the ____.
Answer
scrotum
Question
Why must a very large number of sperms be present in the semen for fertilization to occur?
Answer
To ensure that at least a few are able to reach the upper parts of the oviducts to meet the egg.
Question
After approximately how many months of gestation are the limbs formed in a human embryo?
Answer
Two months.
Question
The process of being pushed out from the mother's body, head first, by powerful contractions of the uterus is called ____.
Answer
birth
Question
During puberty in boys, hair growth occurs on the face (beards, moustaches), chest, and in the _____ region.
Answer
pubic
Question
Adolescence is a critical period marked by rapid physical changes as well as significant _____ and emotional growth.
Answer
mental
Question
List the correct sequence of structures through which sperm passes from production to leaving the body.
Answer
Testis, epididymis, sperm duct, urethra.
Question
What is the main function of the ovaries?
Answer
To produce eggs (ova).
Question
What is the main function of the testes?
Answer
To produce sperms.
Question
What are the two primary functions of the fallopian tubes (oviducts)?
Answer
To serve as the passage for the egg and as the site of fertilisation.
Question
What is the primary function of the uterus?
Answer
It is where the fertilised egg gets fixed (implantation) and develops into a baby.