Answer / Jyoti Singh

The placenta, as previously mentioned in question 254983, is a temporary organ that develops in mammals during pregnancy. Its primary function is to facilitate the exchange of nutrients, waste products, and gases between the mother and developing fetus through the umbilical cord.

After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?

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What is the morphological feature that defines that stage?

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Explain vegetal pole?

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How during gastrulation are the first two germ layers formed? Which are these germ layers?

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Differentiate between amnion and chorion?

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When are archenteron and blastopore formed?

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Explain blastopore?

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What is gastrulation? How during gastrulation are the first two germ layers formed?

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What are extra embryonic membranes?

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Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos?

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Define polyembryony?

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What is umbilical cord?

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