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Q. Blastula lacks

NTA AbhyasNTA Abhyas 2022

Solution:

Blastula means the hollow sphere of cells called blastomeres and it has an inner fluid-filled cavity called a blastocoele. Blastoderm surrounds the blastocoele, and it consists of a layer of blastomeres. Blastopore occurs in gastrula and open into archentron. The blastopore is a pit in the side of the embryo, through which cells fated to be endodermal flow so that they leave the outer surface of the embryo and can create a new inner surface.