NEET Biology Human Reproduction MCQs Set 35

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Multiple Choice Questions

Question 1: The testes are located outside the abdominal cavity in the scrotum, which keeps the temperature of the testes lower than the body temperature by about
(a) 0.5-1 degrees C
(b) 2-2.5 degrees C
(c) 5-6 degrees C
(d) 10 degrees C
Show Answer & Explanation

Answer: (b) 2-2.5 degrees C

Explanation:
1. The scrotum maintains testicular temperature 2 to 2.5 degrees C below body temperature, which is needed for spermatogenesis.

Teacher's Note:
1. If testes fail to descend (cryptorchidism) sperm formation is affected.

Question 2: The number of testicular lobules in each human testis is about
(a) 250
(b) 25
(c) 100
(d) 500
Show Answer & Explanation

Answer: (a) 250

Explanation:
1. Each testis is divided into about 250 compartments called testicular lobules, each containing one to three seminiferous tubules.

Teacher's Note:
1. Seminiferous tubules are the site of sperm formation.

Question 3: Androgens in the male are secreted by
(a) Sertoli cells
(b) spermatogonia
(c) epididymal cells
(d) Leydig cells
Show Answer & Explanation

Answer: (d) Leydig cells

Explanation:
1. Leydig (interstitial) cells lie between seminiferous tubules and secrete testicular hormones called androgens.

Teacher's Note:
1. Sertoli cells nourish germ cells; Leydig cells make testosterone.

Question 4: The correct path taken by sperms from the site of formation to the vas deferens is
(a) seminiferous tubules, vasa efferentia, rete testis, epididymis
(b) rete testis, seminiferous tubules, epididymis, vasa efferentia
(c) seminiferous tubules, rete testis, vasa efferentia, epididymis
(d) epididymis, rete testis, vasa efferentia, seminiferous tubules
Show Answer & Explanation

Answer: (c) seminiferous tubules, rete testis, vasa efferentia, epididymis

Explanation:
1. Seminiferous tubules open into the rete testis, which gives off vasa efferentia leading to the epididymis and then the vas deferens.

Teacher's Note:
1. A mnemonic: STREVE - Seminiferous, Testis rete, Efferentia, Vas deferens via Epididymis.

Question 5: Which of the following is NOT a male accessory gland?
(a) seminal vesicle
(b) mammary gland
(c) prostate
(d) bulbourethral gland
Show Answer & Explanation

Answer: (b) mammary gland

Explanation:
1. Male accessory glands are the paired seminal vesicles, the prostate and the paired bulbourethral glands. Mammary glands are female.

Teacher's Note:
1. Seminal plasma is rich in fructose, calcium and enzymes.

Question 6: Secretions of the bulbourethral glands help in
(a) lubrication of the penis
(b) nourishing sperms
(c) activating sperms
(d) secreting androgens
Show Answer & Explanation

Answer: (a) lubrication of the penis

Explanation:
1. The mucus-rich secretion of the bulbourethral (Cowper's) glands lubricates the penis.

Teacher's Note:
1. Do not confuse with prostate secretion which gives semen its alkaline nature.

Question 7: Primary spermatocytes are
(a) haploid and undergo meiosis I
(b) diploid and undergo meiosis II
(c) haploid and undergo mitosis
(d) diploid and undergo meiosis I
Show Answer & Explanation

Answer: (d) diploid and undergo meiosis I

Explanation:
1. Spermatogonia (2n) grow into primary spermatocytes (2n), which complete meiosis I to form two haploid secondary spermatocytes.

Teacher's Note:
1. Meiosis I is reductional.

Question 8: The process by which spermatids are transformed into spermatozoa is
(a) spermiation
(b) spermatogenesis
(c) spermiogenesis
(d) oogenesis
Show Answer & Explanation

Answer: (c) spermiogenesis

Explanation:
1. Spermiogenesis is the transformation of spermatids into sperms; the release of sperms from the seminiferous tubule lumen is spermiation.

Teacher's Note:
1. Spermiogenesis = shape change; spermiation = release.

Question 9: The release of sperms from the seminiferous tubules is called
(a) spermiogenesis
(b) spermiation
(c) insemination
(d) ejaculation
Show Answer & Explanation

Answer: (b) spermiation

Explanation:
1. After spermiogenesis the sperm heads become embedded in Sertoli cells and are finally released into the lumen by spermiation.

Teacher's Note:
1. Insemination is the deposition of semen into the vagina.

Question 10: Spermatogenesis starts at puberty because of a significant increase in the secretion of
(a) GnRH
(b) oxytocin
(c) relaxin
(d) inhibin only
Show Answer & Explanation

Answer: (a) GnRH

Explanation:
1. At puberty the hypothalamus secretes more gonadotropin releasing hormone, which acts on the anterior pituitary to release LH and FSH.

Teacher's Note:
1. GnRH is a hypothalamic hormone.

Question 11: In the male, LH acts on
(a) Sertoli cells and stimulates spermiogenesis
(b) spermatogonia and stimulates mitosis
(c) seminal vesicle and stimulates fructose secretion
(d) Leydig cells and stimulates androgen synthesis
Show Answer & Explanation

Answer: (d) Leydig cells and stimulates androgen synthesis

Explanation:
1. LH acts on Leydig cells, stimulating synthesis and secretion of androgens. FSH acts on Sertoli cells.

Teacher's Note:
1. Androgens in turn stimulate spermatogenesis.

Question 12: FSH acts on Sertoli cells and stimulates secretion of factors that help in
(a) ovulation
(b) androgen synthesis
(c) spermiogenesis
(d) formation of corpus luteum
Show Answer & Explanation

Answer: (c) spermiogenesis

Explanation:
1. FSH stimulates Sertoli cells to secrete factors that help in spermiogenesis.

Teacher's Note:
1. FSH = Sertoli, LH = Leydig.

Question 13: The head of a human sperm contains an elongated
(a) diploid nucleus
(b) haploid nucleus
(c) triploid nucleus
(d) tetraploid nucleus
Show Answer & Explanation

Answer: (b) haploid nucleus

Explanation:
1. The sperm head carries a haploid nucleus capped by the acrosome.

Teacher's Note:
1. Fusion of haploid sperm and haploid egg restores diploid number.

Question 14: The enzymes of the acrosome help in
(a) penetration of the egg membranes during fertilisation
(b) energy production for the tail
(c) movement of the sperm
(d) production of testosterone
Show Answer & Explanation

Answer: (a) penetration of the egg membranes during fertilisation

Explanation:
1. Acrosomal enzymes dissolve the zona pellucida and corona radiata.

Teacher's Note:
1. Mitochondria in the middle piece supply energy for the tail.

Question 15: The part of a sperm that supplies energy for the movement of the tail is the
(a) head
(b) acrosome
(c) end piece
(d) middle piece
Show Answer & Explanation

Answer: (d) middle piece

Explanation:
1. The middle piece has numerous mitochondria that produce energy for tail movement.

Teacher's Note:
1. Mitochondria are in the middle piece.

Question 16: For normal fertility, at least how many per cent of sperms in an ejaculate must show vigorous motility?
(a) 20 per cent
(b) 60 per cent
(c) 40 per cent
(d) 90 per cent
Show Answer & Explanation

Answer: (c) 40 per cent

Explanation:
1. A normal ejaculate has 200-300 million sperms; at least 60 per cent should have normal shape and size and at least 40 per cent should be vigorously motile.

Teacher's Note:
1. Remember 60 (shape) and 40 (motility).

Question 17: Which of the following is NOT a part of the female reproductive system?
(a) oviduct
(b) vas deferens
(c) uterus
(d) hymen
Show Answer & Explanation

Answer: (b) vas deferens

Explanation:
1. Vas deferens is a male duct.

Teacher's Note:
1. Female duct system: oviducts, uterus, cervix, vagina.

Question 18: The correct order of the layers of the uterine wall from outside to inside is
(a) perimetrium, myometrium, endometrium
(b) endometrium, myometrium, perimetrium
(c) myometrium, perimetrium, endometrium
(d) perimetrium, endometrium, myometrium
Show Answer & Explanation

Answer: (a) perimetrium, myometrium, endometrium

Explanation:
1. The perimetrium is the thin outer membrane, the myometrium the thick middle smooth muscle layer and the endometrium the inner glandular lining.

Teacher's Note:
1. The endometrium undergoes cyclic changes; the myometrium contracts in labour.

Question 19: Which of the following is NOT a part of the external genitalia of the human female?
(a) mons pubis
(b) labia majora
(c) hymen
(d) fimbriae
Show Answer & Explanation

Answer: (d) fimbriae

Explanation:
1. The external genitalia include mons pubis, labia majora, labia minora, hymen and clitoris. Fimbriae are finger-like projections at the infundibulum of the oviduct.

Teacher's Note:
1. Fimbriae help in collecting the ovum after ovulation.

Question 20: The structure that helps in the collection of the ovum after ovulation is the
(a) isthmus
(b) cervix
(c) fimbriae
(d) hymen
Show Answer & Explanation

Answer: (c) fimbriae

Explanation:
1. Finger-like fimbriae on the edge of the infundibulum collect the ovum.

Teacher's Note:
1. Infundibulum is the funnel-shaped part of the oviduct.

Question 21: Each human mammary gland has about how many mammary lobes?
(a) 2-5
(b) 15-20
(c) 30-40
(d) 50-60
Show Answer & Explanation

Answer: (b) 15-20

Explanation:
1. The glandular tissue of each breast is divided into 15-20 mammary lobes containing alveoli.

Teacher's Note:
1. Alveoli secrete the milk.

Question 22: The cells of the alveoli of the mammary gland
(a) secrete milk
(b) secrete oestrogen
(c) form the mammary ampulla
(d) store sperms
Show Answer & Explanation

Answer: (a) secrete milk

Explanation:
1. Alveolar cells secrete milk, which is stored in the lumen; alveoli open into mammary tubules.

Teacher's Note:
1. Mammary ducts join to form the mammary ampulla connected to the lactiferous duct.

Question 23: The correct sequence of events in spermatogenesis is
(a) spermatogonia, secondary spermatocyte, primary spermatocyte, spermatid, spermatozoa
(b) primary spermatocyte, spermatogonia, spermatid, secondary spermatocyte, spermatozoa
(c) spermatogonia, spermatid, primary spermatocyte, secondary spermatocyte, spermatozoa
(d) spermatogonia, primary spermatocyte, secondary spermatocyte, spermatid, spermatozoa
Show Answer & Explanation

Answer: (d) spermatogonia, primary spermatocyte, secondary spermatocyte, spermatid, spermatozoa

Explanation:
1. Spermatogonia multiply by mitosis; primary spermatocytes complete meiosis I to give secondary spermatocytes, which complete meiosis II to give spermatids that become spermatozoa.

Teacher's Note:
1. Mitosis, then meiosis I, then meiosis II, then spermiogenesis.

Question 24: Among spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and spermatozoa, how many are haploid?
(a) one
(b) two
(c) three
(d) five
Show Answer & Explanation

Answer: (c) three

Explanation:
1. Secondary spermatocytes, spermatids and spermatozoa are haploid (n); spermatogonia and primary spermatocytes are diploid.

Teacher's Note:
1. Meiosis I produces the haploid number.

Question 25: The oogenesis in females is initiated during
(a) puberty
(b) embryonic development
(c) birth
(d) menarche
Show Answer & Explanation

Answer: (b) embryonic development

Explanation:
1. Oogonia are formed in each foetal ovary during embryonic development, and they enter prophase I of meiosis and get arrested.

Teacher's Note:
1. Spermatogenesis, by contrast, begins at puberty.

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Human Reproduction Objective Questions & Solutions for NEET Biology

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