Free Reproduction MCQs with Answers

51. Ovulation is triggered by

• A. FSH surge
• B. LH surge
• C. Estrogen decrease
• D. Progesterone increase

Explanation: The LH surge (luteinizing hormone) triggers ovulation, releasing the mature egg from the Graafian follicle.

52. The corpus luteum secretes

• A. FSH and LH
• B. Estrogen and progesterone
• C. hCG
• D. Prolactin

Explanation: The corpus luteum (formed from the ruptured follicle) secretes progesterone and estrogen to maintain the endometrium.

53. Fertilization normally occurs in the

• A. Uterus
• B. Ovary
• C. Fallopian tube
• D. Vagina

Explanation: Fertilization typically occurs in the ampulla of the fallopian tube (oviduct).

54. hCG is produced by

• A. Corpus luteum
• B. Trophoblast/Placenta
• C. Pituitary
• D. Hypothalamus

Explanation: Human chorionic gonadotropin (hCG) is produced by the trophoblast (developing placenta) to maintain the corpus luteum.

55. The morula develops into

• A. Zygote
• B. Blastocyst
• C. Gastrula
• D. Neurula

Explanation: The morula (solid ball of cells) develops into a blastocyst (with inner cell mass and blastocoel) before implantation.

56. Menstruation is caused by

• A. Rise in estrogen
• B. Fall in progesterone and estrogen
• C. Rise in hCG
• D. Rise in LH

Explanation: When pregnancy doesn't occur, the corpus luteum degenerates → progesterone and estrogen fall → endometrium breaks down.

57. Sertoli cells provide

• A. Testosterone
• B. Nourishment to developing sperm
• C. LH
• D. FSH

Explanation: Sertoli (nurse) cells provide nutrients and support to developing sperm cells in the seminiferous tubules.

58. Parturition is triggered by

• A. Rising progesterone
• B. Falling progesterone and rising oxytocin
• C. Rising hCG
• D. Falling estrogen

Explanation: Falling progesterone and rising oxytocin and prostaglandins trigger uterine contractions for childbirth.

59. Receive, retain and nourish a fertilized ovum is the main function of:

• A. Cervix
• B. Uterus
• C. Ovary
• D. Oviduct

Explanation: The blastocyst implants in the thickened endometrium of the uterus, which then supports the pregnancy through the placenta, so receiving, retaining and nourishing are all uterine functions. The oviduct is where fertilisation itself occurs, which is why it is the closest distractor, but the embryo only passes through it. The ovary releases the egg and the cervix is the muscular opening into the vagina.

60. During menstrual cycle, luteinizing hormone (LH) is secreted due to:

• A. Decrease in Estrogen
• B. Decrease in FSH
• C. Increase in FSH
• D. Environmental effect

Explanation: This is the option marked correct in the official UHS answer key. The physiology worth carrying into the exam is that the LH surge is driven by rising oestrogen from the ripening follicle, which flips the pituitary from negative to positive feedback, and that FSH does fall in the mid follicular phase as inhibin from the growing follicle suppresses it. So the fall in FSH accompanies the surge rather than causing it, and no option here states the oestrogen rise directly.