Human Reproduction · Question 89

Which one of the following is the correct matching of the events occurring during menstrual cycle?

1. Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone
2. Menstruation: Breakdown of myometrium and ovum not fertilised
3. Secretory phase: Development of corpus luteum and increased secretion of progesterone
4. Proliferative phase: Rapid regeneration of myometrium and maturation of Graafian follicle

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