Answer / Aishwarya Kumar

The structures mentioned (archenteron and blastopore) are formed during gastrulation, a critical phase of embryonic development that occurs after the morula stage.

What are the functions of placenta?

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From which germ layer do the liver and the pancreas originate?

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What are the cells produced in the first stage of the embryonic development called?

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In which type of animals does the placenta exist?

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Define polyembryony?

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Explain the embryonic development stages after formation of blastula?

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Differentiate between amnion and chorion?

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From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer?

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Are all animals coelomate?

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How is the notochord structure formed?

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What stage follows gastrulation?

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What is the germ layer from which the coeloms originate?

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