Q. No.An organelle covering the head of animal sperm and containing enzymes that digest the egg cell coating, thus permitting the sperm to enter the egg is called as:
1.
nebenkern
2.
manchette
3.
head
4.
acrosome
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Which endometrial stage corresponds to the follicular phase of the menstrual cycle?
| 1. | proliferative | 2. | luteal |
| 3. | secretory | 4. | menstruation |
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The thick transparent glycoprotein membrane surrounding a mammalian ovum before implantation is called:
| 1. | oolemma | 2. | corona radiata |
| 3. | zona pellucida | 4. | cumulus oophorus |
The formation of the three embryonic germ layers is called:
| 1. | morulation | 2. | blastulation |
| 3. | neurulation | 4. | gastrulation |
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 |
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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 |
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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. |
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