Fertilisation, Development and Birth in Animals · NCERT Biology

Cleavage refers to:

  1. Increase in the overall size of the embryo
  2. Differentiation of embryonic tissues into layers
  3. Repeated mitotic divisions of zygote
  4. Formation of the three primary germ layers
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Correct answer: Repeated mitotic divisions of zygote

Cleavage is the rapid mitotic division of the zygote. It increases cell number without increasing size.

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