Q. No.Which one of the following statements about human sperm is correct?
1.
The 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.
The acrosome serves as a sensory structure, leading the sperm towards the ovum.
4.
The 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 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 |
A change in the amount of yolk and its distribution in the egg will affect:
1. formation of zygote
2. pattern of cleavage
3. number of blastomeres produced
4. fertilization
Foetal ejection reflex in human female is induced by:
1. pressure exerted by aminotic fluid
2. release of oxytocin from pituitary
3. fully developed foetus and placenta
4. differentiation of mammary glands
Which one of the following is the most likely root cause of why menstruation is not taking place in regularly cycling human female?
| 1. | Fertilization of the ovum |
| 2. | Maintenance of the hypertrophical endometrial lining |
| 3. | Maintenance of high concentration of sex-hormones in the blood stream |
| 4. | Retention of well-developed corpus luteum |
Seminal plasma in humans is rich in:
| 1. | fructose, calcium and certain enzymes |
| 2. | fructose and calcium but has no enzymes |
| 3. | glucose and certain enzymes but has no calcium |
| 4. | fructose and certain enzymes but poor in calcium |
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) |
Ureter |
Prostate |
Seminal vesicle |
Bulbourethral gland |
|
(b) |
Vas deferens |
Seminal vesicle |
Prostate |
Bulbourethral gland |
|
(c) |
Vas deferens |
Seminal vesicle trial gland |
Bulboure |
Prostate |
|
(d) |
Ureter |
Seminal vesicle |
Prostate |
Bulbourethral gland |
1. (a)
2. (b)
3. (c)
4. (d)
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-spermatocyte-spermatid-sperms |
| 3. | spermatid-spermatocyte-spermatogonia-sperms |
| 4. | spermatogonia-spermatid-spermatocyte-sperms |
Which one of the following is the correct match of the events occurring during the menstrual cycle?
| 1. | Ovulation - LH and FSH attain peak level and sharp fall in the secretion of progesterone |
| 2. | Proliferative phase - Rapid regeneration of myometrium and maturation of Graafian follicle |
| 3. | Development of corpus luteum - Secretory phase and increased secretion of progesterone |
| 4. | Menstruation - Breakdown of myometrium and ovum not fertilized |
1. primary spermatocytes
2. secondary spermatocytes
3. spermatids
4. spermatogonia
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