Human Reproduction

Given below is a diagrammatic sketch for a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D. [Figure]

1. A - Ureter, B - Seminal vesicle, C - Prostate, D - Bulbourethral gland
2. A - Vas deferens, B - Seminal vesicle, C - Prostate, D - Bulbourethral gland
3. A - Vas deferens, B - Seminal vesicle, C - Bulbourethral gland, D - Prostate
4. A - Ureter, B - Prostate, C - Seminal vesicle, D - Bulbourethral gland

Foetal ejection reflex in human female is induced by

1. Pressure exerted by amniotic fluid
2. Differentiation of mammary glands
3. Release of oxytocin from pituitary
4. Fully developed foetus and placenta

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is:

1. spermatocyte - spermatogonia - spermatid - sperms
2. spermatogonia - spermatid - spermatocyte - sperms
3. spermatid - spermatocyte - spermatogonia - sperms
4. spermatogonia - spermatocyte - spermatid - sperms

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

1. Retention of well-developed corpus luteum
2. Maintenance of high concentration of sex hormones in the blood stream
3. Maintenance of the hypertrophical endometrial lining
4. Fertilisation of the ovum

A change in the amount of yolk and its distribution in the egg will affect:

1. Fertilisation
2. Pattern of cleavage
3. Formation of zygote
4. Number of blastomeres produced

In humans, at the end of the first meiotic division, the male germ cells differentiate into the:

1. secondary spermatocytes
2. spermatogonia
3. primary spermatocytes
4. spermatids

Which one of the following statements is incorrect about menstruation?

1. The beginning of the cycle of menstruation is called menarche
2. At menopause in the female, there is especially abrupt increase in gonadotropic hormones
3. The menstrual fluid can easily clot
4. During normal menstruation about 40 ml blood is lost

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

1. Yolk sac
2. Amnion
3. Chorion
4. Allantois

Which part of ovary in mammals acts as an endocrine gland after ovulation?

1. Stroma
2. Vitelline membrane
3. Germinal epithelium
4. Graafian follicle

Sertoli cells are regulated by the pituitary hormone known as-

1. LH
2. FSH
3. GH
4. Prolactin

Withdrawal of which of the following hormones is the immediate cause of menstruation?

1. Progesterone
2. FSH
3. FSH-RH
4. Estrogen

Grey crescent is the area -

1. Just opposite to the site of entry of sperm into ovum
2. At the point of entry of sperm into ovum
3. At the vegetal pole
4. At the animal pole

If mammalian ovum fails to get fertilized, which one of the following is unlikely?

1. Corpus luteum will disintegrate
2. Estrogen secretion further decreases
3. Primary follicle starts developing
4. Progesterone secretion rapidly declines

Ovulation in the human female normally takes place during the menstrual cycle

1. At the beginning of the proliferative phase
2. At the mid secretory phase
3. Just before the end of the secretory cycle
4. At the end of the proliferative phase

Which of the following hormones is not a secretion product of human placenta?

1. Estrogen
2. Progesterone
3. Prolactin
4. Human chorionic gonadotropin

Bartholin's glands are situated

1. on the sides of the head of some amphibians
2. at the reduced tail end of birds
3. on either side of vagina in humans
4. on either side of vas deferens in humans.

During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called:

1. Organizer phenomena
2. Pattern formation
3. Axis formation
4. Anamorphosis

Mainly which type of hormones control the menstrual cycle in human beings?

1. FSH
2. LH
3. FSH, LH, estrogen
4. progesterone

What is true for cleavage?

1. Size of embryo decreases
2. Size of embryo increases
3. Size of cells increases
4. Size of cells decreases

Which set is similar?

1. Corpus luteum – Graafian follicles
2. Sebum – Sweat
3. Bundle of His – Pacemaker
4. Vitamin B7 – Niacin

Which set is similar?

1. Vitamin B7 – Niacin
2. Sebum – Sweat
3. Corpus luteum – Graafian follicles
4. Bundle of His – Pacemaker

Cleavage in mammals is

1. holoblastic equal
2. holoblastic unequal
3. superficial
4. discoidal.

Blastopore is the pore of:

1. A.C.
2. Archenteron
3. Blastocoel
4. Coelom