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Bio Biology

BiologyNEB 2082 (MCQs)

Which is the first stage of embryonic development after fertilization in frog's zygote? a) Blastulation b) Morulation c) Cleavage d) Gastrulation

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Answer

· Based on the official syllabus and past papers
Updated

The first stage of embryonic development after fertilization in a frog's zygote is cleavage.

After fertilization, the zygote undergoes cleavage, a series of rapid mitotic divisions without growth, resulting in the formation of a multicellular blastula. This process is essential for increasing cell number and preparing the embryo for subsequent stages like blastulation and gastrulation.

  • Cleavage is the correct answer because it immediately follows fertilization and precedes blastulation.
  • Blastulation occurs later, forming the blastula.
  • Morulation is not a recognized term in frog embryology.
  • Gastrulation follows cleavage and blastulation, leading to tissue layer formation.

Thus, the correct choice is (c) Cleavage.

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