Human Reproduction Mock Test – Class 12 Biology

1. Twenty secondary oocytes are each successfully fertilised, and every one completes meiosis II normally. Ignoring any later fate of previously formed first polar bodies, which immediate female meiotic products are expected from these secondary oocytes?

2. The following records represent three successive prenatal stages.

Which inference best integrates the three records?

3. One primary spermatocyte and one primary oocyte are each followed through their complete normal gametogenic outcomes, with fertilisation available to permit female meiosis II completion. Which comparison is appropriate?

4. Examination shows that hymenal tissue is still present in an individual. No other evidence about sexual history is available. The most scientifically justified conclusion is:

5. Identify the valid set among these statements about spermatogonia.
I. They occur along the inner wall of seminiferous tubules.
II. They are diploid cells containing chromosomes.
III. Their multiplication includes mitotic divisions.
IV. Every mitotic division of a spermatogonium immediately produces haploid spermatids.

6. Certain cells of the inner cell mass can give rise broadly to the body's tissues and organs. These cells are best described as:

7. The basic organisation of the male reproductive system is best represented by:

8. Evaluate the following statements about ovarian organisation.
I. A thin epithelium covers the ovary.
II. The ovarian stroma has a peripheral cortex.
III. The medulla forms the inner stromal region.
IV. The myometrium forms the outer ovarian stromal zone.

9. Evaluate the following statements about the urethra and vas deferens.
I. The urethra originates from the urinary bladder and extends through the penis.
II. The vas deferens continues from the epididymis and joins the later ejaculatory pathway.
III. The urethral meatus is the external opening of the urethra.
IV. The vas deferens and urethra are two names for the same continuous structure.

10. Ovulation occurs normally, but the newly formed corpus luteum is experimentally removed. Progesterone is then supplied so that its circulating level remains similar to that of a normal luteal phase, and the endometrium remains maintained. What does this experiment most strongly support?

11. Four primary spermatocytes and four primary oocytes are each followed through their normal complete gametogenic outcomes, with fertilisation available to permit completion of female meiosis II. Considering only the major functional gametes produced from these primary meiocytes, what is the male-to-female functional-gamete ratio?

12. A tracer is placed at the fimbrial margin and moves toward the uterus through a normal fallopian tube. Which anatomical sequence should it follow?

13. Pregnancy P produces four offspring as two identical twin pairs, with each pair arising from a different fertilised ovum. Pregnancy Q produces four offspring, each arising from a separate fertilised ovum. How many fewer ova are required in P than in Q?

14. Which comparison correctly distinguishes two reproductive passages?

15. Selective destruction of Leydig cells in an adult male will result in which of the following outcomes?

16. Oviductal transport is experimentally accelerated so that a normal -cell embryo reaches the uterus before it has become a morula or blastocyst. The endometrium is receptive. What is the strongest prediction?

17. A follicle has developed a fluid-filled antrum and differentiated theca interna and externa. Its primary oocyte then completes meiosis I and produces a secondary oocyte with a first polar body. Which transition should occur next in the normal sequence before the oocyte is released?

18. In two previous independent fertilisations, both zygotes were . If -bearing and -bearing sperm remain equally probable for a third fertilisation, what is the probability that the third zygote is ?

19. Assertion: Completion of meiosis I in a primary oocyte produces a secondary oocyte and a first polar body.
Reason: Cytoplasm is divided equally between the two products during this division.

20. The general process of gametogenesis becomes spermatogenesis when it occurs in the ______ and gives rise to male gametes.

21. A mature Graafian follicle ruptures and releases its enclosed secondary oocyte from the ovary. This event is called:

22. Review these statements about ovum-number inference in multiple births.
I. Two fraternal twins require two separately fertilised ova.
II. An identical twin pair can arise from one fertilised ovum.
III. The number of offspring in a pregnancy always equals the number of ova involved.
IV. Knowing whether offspring are identical or arise from separate ova is important when inferring ovum number.

23. Which symbolic pathway correctly follows the principal female gametic cell from a primary oocyte through fertilisation?

24. Which sequence correctly separates implantation from the later formation of the placental interface?

25. Milk secretion by alveolar cells and drainage through mammary tubules are normal. A complete obstruction occurs exactly where a mammary duct would normally empty into the mammary ampulla. Which location should show milk accumulation immediately upstream of the block?

26. Identify the valid set among these statements about the cellular organisation of seminiferous tubules.
I. Spermatogonia belong to the male germ-cell line.
II. Sertoli cells provide nutritional support to developing germ cells.
III. Spermatogonia and Sertoli cells occur within seminiferous tubules.

27. During fetal development, oogonia form normally but are experimentally prevented from entering meiosis I. No new oogonia are added after birth. Which state is most directly expected later?

28. Which sequence best integrates major human reproductive events from gamete availability to postnatal nourishment?

29. During the follicular phase, secretion of both LH and FSH becomes markedly lower than normal while no other primary ovarian defect is present. Which chain of effects is most consistent with this change?

30. Milk produced during the initial days of lactation is called colostrum. Its special importance to the newborn is primarily related to its:

31. A functional map requires one structure for production of female gametes, a paired passage connecting the ovarian region toward the uterus, the organ that supports pregnancy, and the gland system that supports the newborn after birth. The ordered set is:

32. Four multiple-birth records are described.

Which ovum-count relation is correct?

33. Which sequence best integrates the events at the sperm-oocyte interface and immediately afterward?

34. Which sequence places the dominant hormone-source relations in their correct reproductive order from male pubertal activation through pregnancy and childbirth?

35. Match each regulatory signal with the relation that best completes its source-target-effect chain. A Column II entry is used once.

36. Two cell populations are isolated from seminiferous tubules. Population P consists of cells with chromosomes that can multiply without reducing chromosome number. Population Q consists of later cells with chromosomes produced after reduction division. P is most consistent with:

37. In an experiment, LH secretion from the anterior pituitary is selectively suppressed while FSH secretion remains near its previous level. Which immediate testicular change is most strongly supported?

38. Assume two fertilisations are independent and each has probability of producing an zygote. What is the probability that both zygotes are ?

39. A defining combination of human reproductive features is that humans are:

40. A blastocyst develops normally and later gives rise to two major developmental pathways: pathway P begins with the outer cell layer, while pathway Q begins with the inner cell mass. Which relation is correct?

41. Examine the following statements about the menstrual phase.
I. Menstrual flow commonly lasts about .
II. The flow involves breakdown of the endometrium and associated blood vessels.
III. In a cycle without fertilisation, loss of luteal hormonal support contributes to the onset of menstruation.
IV. Menstrual flow represents proliferation and thickening of the endometrium under continued luteal support.

42. Which pair of developmental features is associated with the same approximate prenatal time?

43. Which statement correctly distinguishes the sperm plasma membrane from seminal plasma?

44. GnRH secretion is experimentally suppressed. Group P then receives LH only, whereas group Q receives FSH only; both administered hormones reach their normal testicular targets. Which comparison is expected?

45. A group contains primary spermatocytes. Every cell completes meiosis I and meiosis II normally, and no resulting cell is lost. How many spermatids are produced, and how many chromosomes does each contain?

46. A selective injury leaves spermatogonia present in seminiferous tubules but severely impairs Sertoli-cell function. Which early consequence is most directly expected?

47. A blastocyst retains a functional trophoblast and implants normally, but certain inner-cell-mass cells lose the broad developmental potency normally associated with them. Which effect is most directly expected?

48. During the later phase of pregnancy, placental hCG and hPL secretion remains detectable, but an ovarian secretory defect markedly reduces relaxin production. Which interpretation best fits these findings?

49. A morphologically normal blastocyst reaches the uterus, but the endometrium is severely damaged and cannot provide the normal tissue response around the attaching blastocyst. Which outcome is most directly predicted?

50. Assess the following menstrual-hygiene practices.
I. Use an appropriate absorbent material.
II. Replace the material approximately every as required.
III. Dispose of used absorbent material safely.
IV. Handwashing after changing absorbent material is unnecessary if the material appeared clean.