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

sperm?

1. Sperm is viable for only up to 24 h

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

medium

3. Viability of sperm is determined by its motility

4. Sperms must be concentrated in a thick suspension

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

1. progesterone

2. intestinal mucus

3. glucagon

4. androgens

Which one of the following helps in absorption of phosphorus from soil by plants?

1. Rhizobium

2. Anabaena

3. Frankia

4. Glomus

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?

1. C-lnfundibulum, D-Fimbriae, E-Cervix

2. D-Oviducal funnel, E-Uterus, F-Cervix

3. A-Perimetrium, B-Myometxium, C-Fallopian tube

4. B-Endometrium, C-Infundibulum, D-Fimbriae

Sertoli cells are found in

1. ovaries and secrete progesterone

2. adrenal cortex and secrete adrenalin

3. seminiferous tubules and provide nutrition to germ cells

4. pancreas and secrete cholecystokinin

Vasa efferentia are the ductules leading from

1. testicular lobules to rete testis

2. rete testis to vas deferens

3. vas deferens to epididymis

4. epididymis to urethra

The second maturation division of the mammalian ovum occurs

1. shortly after ovulation before the ovum makes entry imto the Fallopian rube

2. until after the ovum has been penetrated by a sperm

3. until the nucleus of the sperm has fused with that of the ovum

4. in the Graafian follicle following the first maturation division

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

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

egg, resulting in fertilization

2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization

3. Acrosome serves as a sensory structure leading the sperm towards the ovum

4. Acrosome serves no particular function

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

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

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

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

4. It has more cytoplasm and more DNA than an uncleaved zygote 

The part of fallopian tube closest to the ovary is

1. isthmus

2. infundibulum

3. cervix

4. ampulla