Q. No.The rudimentary alimentary cavity of an embryo at the gastrula stage is called:
1. vegetal pole
2. primitive streak
3. archenteron
4. blastocoel
1. vegetal pole
2. primitive streak
3. archenteron
4. blastocoel
An infant can get passive immunity from:
| 1. | infection | 2. | colostrum |
| 3. | anti-Rh Ig | 4. | vaccination with live vaccines |
Morula stage is:
1. the stage of implantation
2. a hollow ball of cells enclosing a fluid filled space
3. a collection of 16-32 cells resembling a raspberry
4. a group of cells that do not undergo cleavage divisions
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 |
In humans, the majority of the placenta is formed by:
1. allantois
2. amnion
3. chorion
4. yolk sac
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.
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