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JIPMER2012ZoologyEvolution

Which one of the following in birds, indicates their reptilian ancestry?

Options

  1. AScales on their hindlimbs
  2. BFour-chambered heart
  3. CTwo special chambers crop and gizzard in their digestive tract
  4. DEggs with a calcareous shell

Correct answer

A. Scales on their hindlimbs

Step-by-step solution

Reptiles too are egg-laying organisms. But in aves, the eggs have a calcareous shell around them. In aves, the heart is four-chambered, while in reptiles the heart is 3 chambered and is incompletely divided to form a four-chambered heart. They have two special chambers called crop and gizzard in their digestive tract. Gizzard is modified for grinding food and crop for storing food on a temporary basis.

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