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.
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
Which part of the ovary in mammals acts as an endocrine gland after ovulation?
| 1. | Graafian follicle | 2. | Stroma |
| 3. | Germinal epithelium | 4. | Vitelline membrane |
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