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.
Question 1What is defined as the process of giving rise to new individuals of the same kind?
Question 2Which of the following is a primary benefit of reproduction for a species?
Question 3Which method of reproduction does NOT involve eggs or sperms?
Question 4In single-celled organisms like Amoeba, what is the most common method of reproduction?
Question 5During binary fission in Amoeba, which part of the cell divides first?
Question 6In Amoeba, the division of the nucleus is immediately followed by the division of what?
Question 7Which multicellular animal is known to reproduce through budding?
Question 8What is the small growth on the outside of a parent body in asexual reproduction called?
Question 9When do buds typically detach from the parent organism in Hydra?
Question 10What is the process of regrowing missing or lost parts of the body called?
Question 11Which animal besides Hydra is mentioned to have great powers of regeneration?
Question 12What happens if a Hydra is cut transversely into 2-3 pieces?
Question 13In sexual reproduction, what are the special reproductive cells produced by males?
Question 14What is the female reproductive cell called?
Question 15What is formed when a sperm and an egg fuse?
Question 16What is the specific name for the fusion of a sperm and an ovum?
Question 17Where are eggs produced in the human female reproductive system?
Question 18What are the two whitish oval bodies in the female abdomen called?
Question 19What is another name for the Fallopian tube?
Question 20What is the function of the Fallopian tube (oviduct)?
Question 21Where do the two oviducts open into?
Question 22Which part of the female reproductive system is popularly known as the birth canal?
Question 23What is the neck of the uterus called?
Question 24Where are sperms produced in the human male reproductive system?
Question 25Where are the testes located in the male body?
Question 26Why are the testes located outside the abdominal cavity?
Question 27What is the role of the epididymis?
Question 28The sperm ducts open into which structure?
Question 29What is the function of the secretion from the seminal vesicles?
Question 30What is the milky fluid called that is a mixture of sperm and glandular secretions?
Question 31Which gland surrounds the base of the urethra and pours an alkaline secretion into the semen?
Question 32What is the primary function of the secretion from Cowper's glands?
Question 33Which tube in males carries both urine and semen?
Question 34On average, how many sperms are contained in a single ejaculation?
Question 35During fertilisation, which part of the sperm penetrates the egg?
Question 36How many sperms can fertilize a single egg?
Question 37What happens to the tail of the sperm during fertilisation?
Question 38Where does the zygote move to after it is formed in the oviduct?
Question 39What is the process of the embryo fixing itself into the wall of the uterus called?
Question 40Implantation leads to which biological state?
Question 41By the end of how many weeks of pregnancy is the human embryo considered to be in an advanced stage?
Question 42Which systems are formed in the embryo by the end of five weeks of pregnancy?
Question 43After how many months of pregnancy are the limbs of the foetus formed?
Question 44What does 'growth' mean in the context of development?
Question 45What is the process where cells become specialized to form different body parts called?
Question 46What is the term for the full term of development of an embryo in the uterus?
Question 47What is the average gestation period in humans?
Question 48During birth, which part of the baby usually emerges first?
Question 49What is the period during which reproductive systems mature in boys and girls?
Question 50At what age does puberty typically start in girls?
Statement 1Reproduction is the process of giving rise to new individuals of the same kind.
Statement 2Reproduction helps in the continuance of the species.
Statement 3Amoeba is a multicellular organism.
Statement 4Asexual reproduction involves the fusion of eggs and sperms.
Statement 5Hydra can reproduce by producing small buds.
Statement 6Sexual reproduction involves two sexes: males and females.
Statement 7Sperms and eggs fuse to form a zygote.
Statement 8Binary fission is common in single-celled organisms like Paramecium.
Statement 9In binary fission, the cytoplasm divides before the nucleus.
Statement 10The two offspring resulting from binary fission live as new individuals.
Statement 11Budding is a process where buds grow on the inside of the parent body.
Statement 12Hydra buds detach themselves when they are big enough for independent existence.
Statement 13Regeneration is the process of regrowing lost or missing body parts.
Statement 14Starfish do not have the power of regeneration.
Statement 15A Hydra cut into pieces can give rise to new individuals from each piece.
Statement 16Most animals reproduce asexually.
Statement 17The male reproductive cell is called the ovum.
Statement 18The fusion of a sperm and an ovum is called fertilisation.
Statement 19A zygote eventually gives rise to an adult organism.
Statement 20The female eggs are produced in the ovaries.
Statement 21Ovaries are located in the upper half of the abdomen.
Statement 22The Fallopian tube is also known as the oviduct.
Statement 23Eggs are released from the ovary into the oviduct.
Statement 24The two oviducts open into the vagina directly.
Statement 25The uterus is also known as the womb.
Statement 26The vagina is popularly known as the birth canal.
Statement 27The cervix is the neck of the uterus.
Statement 28The human male produces sperms in the testes.
Statement 29The testes are located inside the abdominal cavity in humans.
Statement 30The scrotum helps keep the testes at a temperature lower than the body.
Statement 31A temperature 2-3°C lower than the body is suitable for sperm development.
Statement 32Sperm ducts lead into the epididymis.
Statement 33The seminal vesicles produce secretion for sperm transportation.
Statement 34Semen is a mixture of sperms and glandular fluids.
Statement 35The prostate gland pours an acidic secretion into the semen.
Statement 36Cowper's glands provide lubrication for the semen.
Statement 37The male urethra carries both urine and semen.
Statement 38A single ejaculation contains roughly 200 sperms.
Statement 39The sperm's tail helps it swim toward the ovum.
Statement 40Only the tail part of the sperm penetrates the egg during fusion.
Statement 41Fertilisation usually occurs in the uterus.
Statement 42Implantation is the fixing of the embryo in the uterine wall.
Statement 43Pregnancy begins once implantation is successful.
Statement 44An embryo's heart is formed by the end of five weeks.
Statement 45Foetal limbs are formed after the sixth month of pregnancy.
Statement 46Growth is defined as a reversible increase in size and weight.
Statement 47A single-celled zygote divides to form a cluster of cells.
Statement 48Specialisation of cells into tissues is called differentiation.
Statement 49Gestation is the full term of embryo development in the uterus.
Statement 50Human gestation lasts for about 180 days.
Question 1Reproduction is the process of giving rise to new individuals of the ______ kind.
Question 2Single-celled organisms like amoeba reproduce simply by ______ into two.
Question 3Methods of reproduction that do not involve eggs or sperms are called ______ methods.
Question 4In sexual reproduction, males and females produce special types of reproductive cells called ______.
Question 5The fusion of a sperm and an egg forms a ______.
Question 6Binary fission is the most common method of reproduction in ______ organisms.
Question 7In amoeba, the ______ divides into two first during binary fission.
Question 8Following the division of the nucleus in amoeba, the ______ divides to form two daughter cells.
Question 9______ is a process in which buds grow on the outside of the parent body.
Question 10Budding is a common method of reproduction in the multicellular animal ______.
Question 11Buds in Hydra ______ themselves when they are big enough for independent existence.
Question 12The process of regrowing missing or lost parts of the body is called ______.
Question 13Besides Hydra, the ______ is another animal mentioned that has a great power of regeneration.
Question 14If a Hydra is cut ______ into 2-3 pieces, each piece will regenerate into a new individual.
Question 15Special reproductive cells in males are called ______.
Question 16Special reproductive cells in females are called ______.
Question 17The process of fusion between a sperm and an ovum is called ______.
Question 18In the human female, eggs are produced in the ______.
Question 19The ovaries are two whitish ______ bodies lying in the lower abdomen.
Question 20The funnel-shaped tube close to each ovary is called the ______.
Question 21The oviduct is also commonly known as the ______.
Question 22The two oviducts open into a muscular organ called the ______.
Question 23The uterus is also popularly known as the ______.
Question 24The uterus leads to the outside through a muscular tube called the ______.
Question 25The vagina is popularly known as the ______ canal.
Question 26The neck of the uterus is called the ______.
Question 27In females, the ______ from the urinary bladder opens into the vulva.
Question 28Human sperms are produced in the ______.
Question 29The testes lie outside the abdominal cavity in a sac called the ______.
Question 30Testes are kept at a temperature ______ degrees Celsius lower than the body temperature.
Question 31The lower temperature in the scrotum is suitable for sperm ______.
Question 32Sperm-producing tubes in the testes join to form the ______.
Question 33The epididymis leads into a muscular ______.
Question 34The sperm ducts open at the top of the ______.
Question 35The ______ are a pair of lobulated glands that provide a transport medium for sperms.
Question 36The mixture of sperms and glandular fluids is a milky fluid called ______.
Question 37The base of the male urethra is surrounded by the ______ gland.
Question 38The prostate gland pours an ______ secretion into the semen.
Question 39Two small ovoid glands that provide lubrication are called ______ glands.
Question 40The male ______ carries either urine or semen to the outside of the body.
Question 41A single ejaculation of semen contains approximately ______ to 40,000,000 sperms.
Question 42The sperm uses its ______ to swim upward in the female reproductive tract.
Question 43During fertilisation, only the ______ part of the sperm penetrates the egg.
Question 44The zygote grows by ______ division to produce an embryo.
Question 45The fixing of the embryo in the wall of the uterus is called ______.
Question 46Implantation of the embryo produces the state of ______.
Question 47By the end of ______ weeks of pregnancy, the embryo's heart and circulatory system are formed.
Question 48The ______ of the foetus are formed after two months of pregnancy.
Question 49The ______ increase in size and weight of an individual is known as growth.
Question 50The process of cell specialisation leading to different body parts is called ______.
Question 1
What is the process of giving rise to new individuals of the same kind called?
Question 2
Which method of reproduction does not involve eggs or sperms?
Question 3
What is the fusion of a sperm and an egg called?
Question 4
What cell is formed immediately after fertilisation?
Question 5
Which single-celled organism reproduces by binary fission?
Question 6
Which part of the cell divides first during binary fission in Amoeba?
Question 7
What is the common method of reproduction in Hydra?
Question 8
What are the small growths on the outside of a parent body in Hydra called?
Question 9
What is the ability to regrow lost or missing body parts called?
Question 10
Name a multicellular animal besides Hydra that shows regeneration.
Question 11
What are the male reproductive cells in humans called?
Question 12
What are the female reproductive cells in humans called?
Question 13
Where are eggs produced in the human female?
Question 14
What is the scientific name for Fallopian tubes?
Question 15
Where does a fertilised egg develop in the human female?
Question 16
What is the common name for the uterus?
Question 17
What is the muscular tube leading to the outside of the female body called?
Question 18
Which organ is popularly known as the birth canal?
Question 19
What is the neck of the uterus called?
Question 20
Where are sperms produced in the human male?
Question 21
In which sac are the testes located?
Question 22
How many degrees lower than body temperature are the testes kept?
Question 23
What structure leads from the testes to the sperm duct?
Question 24
What is the milky fluid containing sperms called?
Question 25
Which gland surrounds the base of the male urethra?
Question 26
What is the function of the secretion from Cowper's glands?
Question 27
Which tube in males carries both urine and semen?
Question 28
What is the average number of sperms in a single ejaculation?
Question 29
Which part of the sperm contains the nucleus?
Question 30
What part of the sperm is left behind during fertilisation?
Question 31
What is the fixing of the embryo in the uterine wall called?
Question 32
What state is produced by the implantation of an embryo?
Question 33
When does the heart and circulatory system form in an embryo?
Question 34
After how many months are the limbs of a foetus formed?
Question 35
What is the irreversible increase in size and weight called?
Question 36
What is the specialisation of cells into different body parts called?
Question 37
What is the full term of embryo development in the uterus called?
Question 38
What is the average gestation period in humans?
Question 39
What is the period of reproductive maturation called?
Question 40
At what age does puberty typically start in girls?
Question 41
At what age does puberty typically start in boys?
Question 42
What is the first sign of puberty in girls?
Question 43
What is the first sign of puberty in boys?
Question 44
What cycle starts in girls during puberty?
Question 45
What age range defines adolescence?
Question 46
What is another name for adolescents?
Question 47
What percentage of height is gained during adolescence?
Question 48
What percentage of weight is gained during adolescence?
Question 49
What stage follows adolescence?
Question 50
Which girdle in girls becomes trough-shaped during puberty?
Question 1
Define reproduction and explain its significance for the survival of a species.
Question 2
Distinguish between asexual and sexual reproduction with examples.
Question 3
Describe the process of binary fission in Amoeba with the help of steps.
Question 4
What is budding? Explain how it occurs in Hydra.
Question 5
Explain the concept of regeneration and provide an example of how it acts as a reproductive method.
Question 6
Describe the structure and function of the human ovaries.
Question 7
What are Fallopian tubes? State their role in the female reproductive system.
Question 8
Define the uterus and explain its role in pregnancy.
Question 9
Describe the location and function of the testes in the human male.
Question 10
Why are the testes located in the scrotum outside the abdomen?
Question 11
Trace the path of sperm from production to ejaculation.
Question 12
What is semen? Name the glands that contribute to its formation.
Question 13
Compare the structure of a human sperm and a human egg.
Question 14
Explain the process of fertilisation in humans.
Question 15
What is implantation and what is its result?
Question 16
Define gestation and state its duration in humans.
Question 17
Describe the developmental changes in the embryo during the first two months of pregnancy.
Question 18
What is differentiation in the context of growth and development?
Question 19
Explain the process of birth (parturition) in humans.
Question 20
Define puberty and state the average age it begins in boys and girls.
Question 21
List four physical changes that occur in girls during puberty.
Question 22
List four physical changes that occur in boys during puberty.
Question 23
What is adolescence? Why are adolescents called 'teenagers'?
Question 24
Describe the psychological changes that occur during adolescence.
Question 25
Explain the characteristics of the adulthood stage of human life.
Question 26
What is the difference between binary fission and multiple fission?
Question 27
Explain the importance of the alkaline secretion from the prostate gland.
Question 28
What happens to the zygote as it moves from the Fallopian tube to the uterus?
Question 29
Describe the function of the vagina in the female reproductive system.
Question 30
How does the diet or health of the mother affect the gestation period?