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Which one of the following includes all homologous organs?

1. The wing of butterfly, wing of bird, wing (patagia) of bat
2. The fore limb of frog, wing of bird and fore limb of rabbit
3. The thoracic leg of cockroach, the hind leg of frog and fore leg of rabbit
4. The wing of bird, wing of bat and wing of 'flying' lizard

Correct answer: The fore limb of frog, wing of bird and fore limb of rabbit

Solution

Homologous organs have a common ancestral origin and similar basic structural plan, though they may perform different functions. The fore limb of frog, wing of bird, and fore limb of rabbit are all modified vertebrate forelimbs, so they are homologous.

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