Termination of gastrulation is indicated by:
Correct answer: A. Obliteration of blastocoel
- A. Obliteration of blastocoel
- B. Obliteration of archenteron
- C. Closure of blastopore
- D. Closure of neural tube
Explanation
During gastrulation, the blastula undergoes significant changes to form the three germ layers: ectoderm, mesoderm, and endoderm. As these layers form, the blastocoel, which is the fluid-filled cavity of the blastula, becomes gradually reduced in size and is eventually filled in by the newly formed cells. The obliteration of the blastocoel signifies the completion of gastrulation and the establishment of the germ layers.
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