ISC BIOLOGY Class-12 Chapter 3. Human Reproduction MCQ

ISC BIOLOGY

Class-12

Chapter 3. Human Reproduction

MCQ

1. Role of placenta is to—

(a) provide nutrition to developing embryo

(b) protect embryo from shock

(c) act as storage organ

(d) convey nerve impulses

2. Graafian follicles are found in—

(a) testis of mammal

(b) ovary of frog

(c) ovary of cockroach

(d) ovary of mammals

3. Clitoris in females is—

(a) homologous to penis

(b) analogous to penis

(c) functional penis in female

(d) non-functional

4. Egg is liberated from ovary in—

(a) secondary oocyte stage

(b) primary oocyte stage

(c) oogonial stage

(d) mature ovum stage

5. Site of fertilization in human beings is—

(a) ovary

(b) uterus

(c) vagina

(d) fallopian tube

6. Location and secretion of leydig cells are—

(a) Liver-cholesterol

(b) Ovary-estrogen

(c) Testis-testosterone

(d) Pancreas-glucagon

7. Which of the following is primary sex organ ?

(a) Scrotum

(b) Penis

(c) Testis

(d) Prostate

8. In 28 days of human ovarian cycle, ovulation occurs on—

(a) Day 1

(b) Day 5

(c) Day 14/15

(d) Day 28

9. Prostate gland is present—

(a) on ureter

(b) on kidney

(c) on testis

(d) around urethra

10. Corpus luteum develops from—

(a) Oocyte

(b) Nephrostome

(c) Graafian follicle

(d) None of the above

11. Corpus luteum secretes—

(a) LH

(b) Estrogen

(c) Progesterone

(d) FSH

12. Spermatozoa are nourished during their development by—

(a) Sertoli cells

(b) Interstitial cells

(c) Connective tissue cells

(d) None of the above

13. Sperms produce an enzymatic substance for dissolving egg membrane called—

(a) Hyaluronic acid

(b) Hyaluronidase

(c) Androgen

(d) Estrogen

14. In uterus, endometrium increases in thickness in response to—

(a) Oxytocin

(b) Estrogen

(c) LH

(d) Relaxin

15. Identify the odd from the following—

(a) Labia minora

(b) Fimbriae

(c) Infundibulum

(d) Isthmus

16. Which of the following is immortal ?

(a) Somatic cell

(b) Glomerular cell

(c) Germ cell

(d) Cells of pituitary

17. Sertoli cells are regulated by the pituitary hormone known as—

(a) LH

(b) FSH

(c) GH

(d) Prolactin

18. The embryo at 16 celled stage is known as —

(a) Morula

(b) Gastrula

(c) Blastula

(d) Blastomere

19. Amniocentesis is a technique used to—

(a) Determine errors in amino acid metabolism in embryo

(b) Pinpoint specific cardiac ailments in embryo

(c) Determine any hereditary/genetic abnormality in embryo

(d) All of the above

20. 1st polar body is formed at which stage of oogenesis—

(a) 1st meiosis

(b) 2nd mitosis

(c) 1st mitosis

(d) Differentiation

21. Which layer develops first during embryonic development ?

(a) Ectoderm

(b) Mesoderm

(c) Endoderm

(d) Both (b) and (c)

22. A change in the amount of yolk and its distribution in the egg will affect—

(a) Fertilization

(b) Formation of zygote

(c) Pattern of cleavage

(d) Number of blastomeres produced

23. Which among the following has 23 chromosomes ?

(a) Spermatogonia

(b) Zygote

(c) Secondary oocyte

(d) Oogonia

24. The Leydig cells found in the human body are the secretory source of—

(a) Progesterone

(b) Intestinal mucus

(c) Glucagon

(d) Androgens

25. About which day in a normal human mentrual cycle does rapid secretion of LH (popularly called LH

surge) normally occurs ?

(a) 14th day

(b) 20th day

(c) 5th day

(d) 11th day

26. Signals for parturition originate from—

(a) Both placenta as well as fully developed foetus

(b) Oxytocin released from maternal pituitary

(c) Placenta only

(d) Fully developed foetus only

27. In the absence of acrosome, the sperm—

(a) Cannot get food

(b) Cannot swim

(c) Cannot penetrate the egg

(d) Cannot get energy

28. What is present in the middle piece of sperm ?

(a) Acrosome

(b) Mitochondria

(c) Nucleus

(d) Proximal centriole

29. Hormone responsible for the secretion of milk after parturition is—

(a) ICSH

(b) Prolactin

(c) ACTH

(d) LH

30. Gastrulation involves the differentiation of —

(a) ectoderm and endoderm

(b) ectoderm, endoderm and mesoderm

(c) ectoderm and mesoderm

(d) mesoderm and endoderm

31. The mesoderm gives rise to all of the following structure in the fully developed animal except—

(a) muscular system

(b) nervous system

(c) circulatory system

(d) gonads

32. Human embryo is protected by —

(a) allantois

(b) amniotic cavity

(c) pleural cavity

(d) peritoneal cavity

33. During cleavage, what is true about cells ?

(a) nucleocytoplasmic ratio remains unchanged

(b) size does not increase

(c) less consumption of oxygen

(d) division is like meiosis.

34. Extra embryonic membranes of mammalian embryo are derived from —

(a) inner cells mass

(b) trophoblast

(c) formative cells

(d) follicle cells

35. Villi of human placenta develop from —

(a) chorion

(b) allantois

(c) yolk sac

(d) amnion

36. Correct sequence in embryonic development is—

(a) Fertilization → Zygote → Cleavage → Morula → Blastula →Gastrula

(b) Zygote →Fertilization →Cleavage →Morula →Blastula →Gastrula

(c) Morula →Fertilization →Zygote →Cleavage →Blastula →Gastrula

(d) None of these

37. 32-celled stage of human embryo is—

(a) Larger than fertilized egg

(b) Smaller than fertilized egg

(c) Same size as fertilized egg

(d) Four times larger than fertilized egg

38. Morula resembles a—

(a) Mulberry fruit

(b) Football

(c) Hollow ball

(d) None of the above

39. Full form of GIFT—

(a) Gamete intrafallopian transfer

(b) Gonad intrafallopian transfer

(c) Both (a) and (b)

(d) None of these

Ans. 1. (a), 2. (d), 3. (a), 4. (a), 5. (d), 6. (c), 7. (c), 8. (c), 9. (d), 10. (c), 11. (c), 12. (a), 13. (b), 14. (b), 15. (a). 16. (c), 17. (b), 18. (c), 19. (b), 20. (a). 21. (c), 22. (c), 23. (c), 24. (d), 25. (a), 26. (a), 27. (c), 28. (b), 29. (b). 30. (b), 31. (b), 32. (b), 33. (b), 34. (b), 35. (a), 36. (a), 37. (b), 38. (a), 39. (a).