Q. No.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 |
The rudimentary alimentary cavity of an embryo at the gastrula stage is called:
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 |
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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
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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 |
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