Fertilisation, Development and Birth in Animals · NCERT Biology

In birds, the embryo develops inside the egg mainly due to:

  1. Presence of placenta
  2. Large amount of yolk
  3. Internal fertilisation only
  4. Lack of cleavage
Show answer and explanation

Correct answer: Large amount of yolk

Yolk provides nutrition for the developing embryo. This supports complete development inside the egg.

Difficulty: Medium Question 15 of 20

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