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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.

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Human Reproductive SystemMenstrual CycleSexually Transmitted Diseases
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1,220 questions · page 12 of 61

221. Fertilization in humans normally occurs in:

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

Explanation: Fertilization takes place in the ampullary region of fallopian tube.

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Correct answer: Fallopian tube

222. Which extraembryonic membrane forms the placenta?

  • A. Amnion
  • B. Chorion
  • C. Allantois
  • D. Yolk sac

Explanation: Chorion develops chorionic villi, forming placenta with uterine tissue.

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Correct answer: Chorion

223. Menstrual cycle in human females is of about:

  • A. 7 days
  • B. 14 days
  • C. 21 days
  • D. 28 days

Explanation: The average menstrual cycle lasts 28 days.

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Correct answer: 28 days

224. The first milk produced by mother after childbirth is:

  • A. Serum
  • B. Colostrum
  • C. Plasma
  • D. Albumin

Explanation: Colostrum is rich in antibodies (IgA) for newborn immunity.

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Correct answer: Colostrum

225. The surgical method to prevent pregnancy in males is:

  • A. Tubectomy
  • B. Vasectomy
  • C. Coitus interruptus
  • D. Condom

Explanation: Vasectomy involves cutting/tying vas deferens.

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Correct answer: Vasectomy

226. The internal lining of the uterus wall is called:

  • A. Perimetrium
  • B. Myometrium
  • C. Endometrium
  • D. Mesometrium

Explanation: Endometrium is shed during menstruation and prepares for implantation.

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Correct answer: Endometrium

227. In mammals, mode of reproduction:

  • A. Oviparous
  • B. Ovoviviparous
  • C. Viviparous
  • D. Larviparous

Explanation: Mammals give birth to live young (viviparity).

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Correct answer: Viviparous

228. Which gland secretes seminal fluid in humans?

  • A. Prostate gland
  • B. Seminal vesicles
  • C. Cowper's gland
  • D. All of these

Explanation: Seminal fluid is contributed by prostate, seminal vesicles, and Cowper's glands.

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Correct answer: All of these

229. In humans, the process of oogenesis begins:

  • A. At puberty
  • B. At fertilization
  • C. Before birth
  • D. At menopause

Explanation: Oogonia form and enter meiosis I during fetal life.

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Correct answer: Before birth

230. Number of chromosomes in human sperms is:

  • A. 23
  • B. 46
  • C. 22
  • D. 44

Explanation: Sperm are haploid, carrying 23 chromosomes.

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Correct answer: 23

231. Which of the following is a natural contraceptive?

  • A. Condom
  • B. Withdrawal method
  • C. Oral pill
  • D. Copper-T

Explanation: Coitus interruptus (withdrawal) is a natural birth control method.

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Correct answer: Withdrawal method

232. The hormone responsible for milk secretion after childbirth is:

  • A. Oxytocin
  • B. Prolactin
  • C. Progesterone
  • D. LH

Explanation: Prolactin from anterior pituitary stimulates milk secretion; oxytocin causes milk ejection.

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Correct answer: Prolactin

233. The Leydig cells in testes secrete:

  • A. Estrogen
  • B. Progesterone
  • C. Testosterone
  • D. FSH

Explanation: Interstitial Leydig cells produce testosterone, essential for spermatogenesis and secondary sex characters.

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Correct answer: Testosterone

234. The Sertoli cells function to:

  • A. Nourish developing sperm
  • B. Secrete testosterone
  • C. Transport sperm
  • D. Produce FSH

Explanation: Sertoli cells support, nourish, and protect developing sperm cells.

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Correct answer: Nourish developing sperm

235. Spermatogenesis in humans is regulated by:

  • A. FSH and LH
  • B. Progesterone and estrogen
  • C. TSH and ACTH
  • D. Oxytocin and prolactin

Explanation: FSH stimulates Sertoli cells, LH stimulates Leydig cells → testosterone → spermatogenesis.

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Correct answer: FSH and LH

236. In human sperm, mitochondria are located in the:

  • A. Head
  • B. Neck
  • C. Middle piece
  • D. Tail

Explanation: The middle piece of sperm contains mitochondria to provide ATP for motility.

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Correct answer: Middle piece

237. The human ovum is:

  • A. Motile
  • B. Non-motile
  • C. Flagellated
  • D. Ciliated

Explanation: The ovum is large, non-motile, moved by cilia and muscular contractions of fallopian tube.

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Correct answer: Non-motile

238. The total number of primary oocytes in a female at birth is about:

  • A. 2-4 million
  • B. 100,000
  • C. 10,000
  • D. 200

Explanation: Females are born with ~2-4 million primary oocytes, most degenerate by puberty.

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Correct answer: 2-4 million

239. Ovulation in humans occurs on about the:

  • A. 7th day of cycle
  • B. 14th day of cycle
  • C. 21st day of cycle
  • D. 28th day of cycle

Explanation: LH surge on ~14th day causes rupture of Graafian follicle → ovulation.

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Correct answer: 14th day of cycle

240. Human chorionic gonadotropin (hCG) is secreted by:

  • A. Ovary
  • B. Placenta
  • C. Pituitary gland
  • D. Follicle

Explanation: hCG maintains corpus luteum during early pregnancy.

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Correct answer: Placenta
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