Answer / Raju Kumar Roy

The yolk sac forms from the endoderm germ layer during embryonic development. It provides nutrients to the developing embryo, especially in animals with large yolks, such as birds and reptiles.

What is placenta?

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Genetically what are the two types of twins that can be generated?

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What is the main function of placenta?

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What are the destinations of the archenteron and of the blastopore?

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Explain coeloms.

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How are animals classified according to the germ layers present in their embryonic development?

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What is gastrulation?

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How is the yolk sac formed?

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Explain animal pole?

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When are archenteron and blastopore formed?

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What are the three types of germ layers that form tissues and organs in animals?

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Name the three types of germ layers that form tissues and organs in animals?

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