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Human Reproduction · Question 44

NEET 2016 (Phase 1)MCQMedium📈 Topic in 50% papers+4−1
1

Changes in GnRH pulse frequency in females is controlled by circulating levels of

  1. progesterone only
  2. progesterone and inhibin
  3. estrogen and progesterone
  4. estrogen and inhibin.

Answer

(3) estrogen and progesterone

Solution

GnRH is secreted by the hypothalamus in pulses.

⇒ The ovarian steroid hormones, estrogen and progesterone, exert feedback on the hypothalamus.

∴ Rising estrogen (follicular phase) increases the pulse frequency, while high progesterone (luteal phase) slows it down.

∵ Inhibin acts mainly on the pituitary (FSH), not on the GnRH pulse generator.

Hence, the GnRH pulse frequency is controlled by circulating estrogen and progesterone.

Answer: (3)

NEET 2016 (Phase 1)

Keep practising — Human Reproduction

2

Fertilisation in humans is practically feasible only if

  1. the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix
  2. the sperms are transported into cervix within 48 hrs of release of ovum in uterus
  3. the sperms are transported into vagina just after the release of ovum in Fallopian tube
  4. the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the Fallopian tube.
NEET 2016 (Phase 1)
3

Select the incorrect statement.

  1. LH and FSH decrease gradually during the follicular phase.
  2. LH triggers secretion of androgen from the Leydig cells.
  3. FSH stimulates the Sertoli cells which help in spermiogenesis.
  4. LH triggers ovulation in ovary.
NEET 2016 (Phase 1)
4

Identify the correct statement on 'inhibin'.

  1. Is produced by granulosa cells in ovary and inhibits the secretion of LH
  2. Is produced by nurse cells in testes and inhibits the secretion of LH
  3. Inhibits the secretion of LH, FSH and prolactin
  4. Is produced by granulosa cells in ovary and inhibits the secretion of FSH
NEET 2016 (Phase 1)
5

Which of the following depicts the correct pathway of transport of sperms?

  1. Rete testis Efferent ductules Epididymis Vas deferens
  2. Rete testis Epididymis Efferent ductules Vas deferens
  3. Rete testis Vas deferens Efferent ductules Epididymis
  4. Efferent ductules Rete testis Vas deferens Epididymis
NEET 2016 (Phase 2)
6

Match column I with column II and select the correct option using the codes given below.

  1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  4. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
NEET 2016 (Phase 2)
7

Several hormones like hCG, hPL, estrogen, progesterone are produced by

  1. ovary
  2. placenta
  3. Fallopian tube
  4. pituitary.
NEET 2016 (Phase 2)
8

In human females, meiosis-II is not completed until

  1. uterine implantation
  2. birth
  3. puberty
  4. fertilisation
AIPMT 2015
9

Which of the following layers in an antral follicle is acellular?

  1. Stroma
  2. Zona pellucida
  3. Granulosa
  4. Theca interna
AIPMT 2015
10

Which of the following events is not associated with ovulation in human life?

  1. Release of secondary oocyte
  2. LH surge
  3. Decrease in estradiol
  4. Full development of Graafian follicle
AIPMT 2015
11

Ectopic pregnancies are referred to as

  1. implantation of defective embryo in the uterus
  2. pregnancies terminated due to hormonal imbalance
  3. pregnancies with genetic abnormality
  4. implantation of embryo at site other than uterus.
AIPMT 2015

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