The main function of mammalian corpus luteum is to produce

  • estrogen only

  • progesterone

  • human chorionic gonadotropin

  • relaxin only

Select the correct option describing gonadotropin activity in a normal pregnant female

  • High level of FSH and LH stimulates the thickening of endometrium

  • High level of FSH and LH facilitate implantation of the embryo

  • High level of HCG stimulates the synthesis of estrogen and progesterone

  • High level of HCG stimulates the thickening of endometrium

Which one of the following is not the function of placenta?

  • facilitates supply of oxygen and nutrients to embryo

  • secretes oestrogen

  • facilitates removal of carbon dioxide and waste material from embryo

  • secretes oxytocin during parturition

Which one of the following statements is false in respect of viability of mammalian

sperm?

medium

  • Sperm is viable for only up to 24 h

  • Survival of sperm depends on the pH of the medium and is more active in alkaline

  • Viability of sperm is determined by its motility

  • Sperms must be concentrated in a thick suspension

In a normal pregnant woman, the amount of total gonadotropin activity was assessed.

The result expected was

embryo

  • High level of circulating FSH and LH in the uterus to stimulate implantation of the

  • High level of circulating HCG to stimulate endometrial thickening

  • High levels of FSH and LH in uterus to stimulate endometrial thickening

  • High level of circulating HCG to stimulate oestrogen and progesterone synthesis

The Leydig cells as found in the human body are the secretory source of

  • progesterone

  • intestinal mucus

  • glucagon

  • androgens

If for some reason, the vasa efferentia in the human reproductive system get blocked,

the gametes will not be transported from

  • epididymis to vas deferens

  • ovary to uterus

  • vagina to uterus

  • testes to epididymis

The figure given below depicts a diagrammatic sectional view of the female

reproductive system of humans. Which one set of three parts out of A-F have been

correctly identified?

  • C-lnfundibulum, D-Fimbriae, E-Cervix

  • D-Oviducal funnel, E-Uterus, F-Cervix

  • A-Perimetrium, B-Myometxium, C-Fallopian tube

  • B-Endometrium, C-Infundibulum, D-Fimbriae

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for

  • escaping any possible compression by the visceral organs

  • providing more space for the growth of epididymis

  • providing a secondary sexual feature for exhibiting the male sex

  • maintaining the scrotal temperature lower than the internal body temperature

Sertoli cells are found in

  • ovaries and secrete progesterone

  • adrenal cortex and secrete adrenalin

  • seminiferous tubules and provide nutrition to germ cells

  • pancreas and secrete cholecystokinin

Vasa efferentia are the ductules leading from

  • testicular lobules to rete testis

  • rete testis to vas deferens

  • vas deferens to epididymis

  • epididymis to urethra

The second maturation division of the mammalian ovum occurs

  • shortly after ovulation before the ovum makes entry imto the Fallopian rube

  • until after the ovum has been penetrated by a sperm

  • until the nucleus of the sperm has fused with that of the ovum

  • in the Graafian follicle following the first maturation division

Which one of the following statements about human sperm is correct?

egg, resulting in fertilization

  • Acrosome has a conical pointed structure used for piercing and penetrating the

  • The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization

  • Acrosome serves as a sensory structure leading the sperm towards the ovum

  • Acrosome serves no particular function

Which one of the following statements about morula in humans is correct?

  • It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA

  • It has far less cytoplasm as well as less DNA than in an uncleaved zygote

  • It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote

  • It has more cytoplasm and more DNA than an uncleaved zygote 

The part of fallopian tube closest to the ovary is

  • isthmus

  • infundibulum

  • cervix

  • ampulla

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

  • formation of zygote

  • pattern of cleavage

  • number of blastomeres produced

  • fertilization

Foetal ejection reflex in human female is induced by

  • pressure exerted by amniotic fluid

  • release of oxytocin from pitutary

  • fully developed foetus and placenta

  • differentiation of mammary glands

Which one of the following is the most likely reason of not occuring regular menstruation cycle in females ?

  • Fertilisation of the ovum

  • Maintainance of the hypertrophical endometrial lining

  • Maintainance of high concentration of sex-hormones in the blood stream

  • Retention of well-developed corpus luteuin

Given below is a diagrammatic sketch of a portion of human male reproductive system.

Select the correct set of the names of the parts labelled A, B, C, D.

         A                         B                             C                                    D

  • Ureter                Prostate                 Seminal vesicle              Bulbourethral gland

  • Vas deferens       Seminal vesicle       Prostate                        Bulbourethral gland

  • Vas deferens       Seminal vesicle       Bulbourethral gland        Prostate

  • Ureter                Seminal vesicle       Prostate                        Bubourethral gland

The correct sequence of spermatogenetic stages leading to the formation of sperms in a

mature human testis is

  • spermatocyte - spermatogonia - spermatid - sperms

  • spermatogonia - spermatocyte - spermatid -sperms

  • spermatid-spermatocyte-spermatogonia -sperms

  • spermatogonia-spermatid-spermatocyte -sperms

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

the 

  • primary spermatocytes

  • secondary spermatocytes

  • spermatids

  • spermatogonia

Which extra embryonic membrane in humans prevents desiccation of the embryo inside

the uterus ?

  • Chorion

  • Allantois

  • Yolk sac

  • Amnion

Which one of the following statement is incorrect about menstruation?

hormones

  • During normal menstruation about 40 mL blood is lost

  • The menstrual fluid can easily clot

  • At menopause in the female, there is especially abrupt increase in gonadotropic

  • The beginning of the cycle of menstruation is called menarche

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

  • Graafian follicle

  • Stroma

  • Germinal epithelium

  • Vitelline membrane

In the human female, menstruation can be deferred by the administration of:

  • LH only

  • Combination of FSH and LH

  • Combination of estrogen and progesterone

  • FSH only

Ultrasound of how much frequency is beamed into human body for sonography ?

  • 30-45 MHz

  • 15-30 MHz

  • 1-15 MHz

  • 45-70 MHz

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

  • Estrogen

  • FSH

  • FSH-RH

  • Progesterone

Which of the following statements is incorrect ?

spermiogenesis.

into a sphere of aggregated blastomeres.

developing embryo.

  • The spermatids differentiate into structurally complex spermatozoa by the process of

  • Fertilisation is a physico-chemical event.

  • Cleavage transforms the fertilized ovum into a sphere of aggregated blastomeres.

  • Cleavage divisions bring appreciable increase in the mass of protoplasm in the

Cleavage differs from mitosis in lacking

  • synthetic phase

  • growth phase

  • both 1. and 2.

  • all of these

Low levels of LH during the secretory phase of the menstrual cycle are primarily due to

  • high estrogen level

  • inhibin

  • high progesterone level

  • high estrogen and progesterone level.

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