Q. No.Chorion in terrestrial vertebrate embryos:
1.
prevents desiccation of the embryo
2.
helps in the exchange of oxygen and carbon dioxide with the environment
3.
perform excretory functions
4.
acts as a shock absorber
The functions of the placenta include:
| I: | Acts as an excretory organ. |
| II: | Acts as a respiratory organ. |
| III: | Acts as an endocrine organ. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
During cleavage divisions, successive blastomeres:
1. have a decreasing nuclear/cytoplasmic ratio
2. become smaller and smaller
3. grow larger and larger
4. undergo meiotic divisions.
A maturing ovarian follicle consisting of an oocyte surrounded by two or more layers of tall, supporting granulosa cells but lacking an antrum is:
| 1. | Primordial follicle | 2. | Primary follicle |
| 3. | Secondary follicle | 4. | Graafian follicle |
Identify the correctly matched pair:
| 1. | cryptorchidism: failure of testes to descend into the scrotum |
| 2. | semen: largest contributor is prostate |
| 3. | puberty: stage of development before the reproductive organs become functional |
| 4. | primordial follicle: the first stage of meiosis for oogenesis |
Sperm-producing cells have unique antigens yet they are not attacked by the immune cells because of:
| 1. | antigens are recognized as self-antigens. |
| 2. | acrosome at the tip. |
| 3. | protection by the blood-testis barrier. |
| 4. | inhibitors attached on the surface. |
Menstrual irregularities may be seen in women athletes due to:
| 1. | increase in androgen secretion by the adrenal cortex |
| 2. | decrease in androgen secretion by the adrenal cortex |
| 3. | increased secretion of GnRH |
| 4. | decreased secretion of GnRH |
Chose the correct chronological order in which the following cells are produced:
| a. | primary spermatocytes | b. | secondary spermatocytes |
| c. | spermatids | d. | spermatogonia |
| e | sperm cells |
| 1. | a,b,c,d,e | 2. | b,a,c,e,d |
| 3. | c,a,b,d,e | 4. | d,a,b,c,e |
A pair of sponge-like regions of erectile tissue which contain most of the blood in the penis during an erection are called:
| 1. | corpus spongiosum | 2. | corpora cavernosa |
| 3. | crus of the penis | 4. | glans penis |
What is present in the follicles in the ovary of a girl at birth?
| 1. | primary oocytes | 2. | secondary oocytes |
| 3. | oogonia | 4. | ova |
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