21 Questions with Answers and Explanations on “Human Reproductions” for Biology Students:
Image Source: online.science.psu.edu
Q. 1. Mention the different parts of human male reproductive system.
Ans. 1. Testes (1 pair),
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2. Glands,
3. Accessory ducts
4. External genitalia.
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Q. 2. Mention the role of scrotum/scrotal sacs.
Ans. 1. It holds the testis.
2. Provides low temperature (2-2.5°c less) than the body.
Q. 3. What is the number of testicular lobules and seminiferous tubules in each lobule in human testis?
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Ans. Testicular lobules-250 in each testis.
Semineferous tubules in each lobule-1-3.
Q. 4. Mention the cells that are present on inner layer of semineferous tubules.
Ans. 1. Male germ cells (spermatogonia)
2. Sertoli cells.
Q. 5. What are these structures collectively called? Vasa efferentia, rete testis, epididymis and vas deferens.
Ans. Human male sex accessory ducts.
Q. 6. What is urethral meatus?
Ans. It is the external opening of urethra at the penis.
Q. 7. What are the two zones of stroma of human ovary?
Ans. 1. Peripheral cortex
2. Inner medulla.
Q. 8. How is birth canal formed?
Ans. The birth canal is formed from—
1. Cervical canal and
2. Vagina.
Q. 9. Write the function of: 1. Endometrium 2. Myometrium in human female.
Ans. Uterine wall Function:
1. Endometrium—
Cyclic changes during menstrual cycle.
2. Myometrium—
Strong contration during delivery of the child, (child birth).
Q. 10. What are these structures/parts collectively known? Mons pubis, labia majora, labia minora, hymen and clitoris.
Ans. Human female external genitalia.
Q. 11. At what age or stage does the spermatogenesis start in a male individual?
Ans. At puberty.
Q. 12. Name the hormones that maintain the functions of male sex accessory ducts and glands.
Ans. Testicular hormones (androgens).
Q. 13. At what stage/age does the oogenesis initiate in human female?
Ans. Embryonic development.
Q. 14. Name the ovarian hormone that is high during ovulation in human female. Ans. Esterogen.
Q. 15. At which phase of menstrual cycle the hormone level of progesterone is high?
Ans. Leutal phase (secretory phase).
Q. 16. Mention the hormone released by pituitary that induces rupture of Graafian follicle and then its release.
Ans. LH (Luteinising hormone).
Q. 17. Which event does block the entry of additional sperms into an ovum?
Ans. Fertilization process.
Q. 18. Mention the end products of second meiotic division of secondary oocyte.
Ans. 1. Second polar body
2. A haploid ovum (ootid).
Q. 19. Fill in the blanks:
(a) Humans reproduce———- (asexually/sexually).
(b) Flumans are—————– (oviparous, viviparous, ovoviviparous).
(c) Fertilization is————— in humans (external/internal).
(d) Male and female gametes are————- (diploid/haploid).
(e) Zygote is————– (diploid/haploid).
(f) The process of release of ovum from a mature follicle is called—– .
(g) Ovulation is induced by a hormone called———– .
(h) The fusion of male and female gametes is called——- .
(i) Fertilization takes place in———– .
(j) Zygote divides to form————— which is implanted in uterus.
(k) The structure which provides vascular connection between the foetus and uterus is called—————-.
Ans. (a) sexually
(b) Viviparous
(c) Internal
(d) Haploid
(e) Diploid
(f) Ovulation
(g) LH
(h) Fertilization
(i) Oviduct
(J) blastomeric
(k) Placenta.
Q. 20. Identify true/false statements. Correct each false statement to make it true.
(a) Androgens are produced by Sertoli cells. (True/False)
(b) Spermatozoa get nutrition from Sertoli cells. (True/False)
(c) Leydig cells are found in ovary. (True/False)
(d) Leydig cells synthesis eandrogens. (True/False)
(e) Oogenesis takes place in corpus luteum. (True/False)
(f) Menstrual cycle ceases during pregnancy. (True/False)
(g) Presence or absence of hymen is not a reliable indicator of virginity or no sexual experience. (True/False)
Ans. (a) False. It is produced by leydig cells.
(b) True,
(c) False. It is found in human testis.
(d) True,
(e) False. Ovary.
(f) True.
(g) True.
Q. 21. How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
Ans. 6 eggs.