Question

Assertion 1: Wings of a bat and a bird are analogous organs.

Assertion 2: Forelimbs of a bat and a bird are homologous organs.

Reason : Wings of a bat and a bird do not share a common origin.

• A. A1, A2 and R are true and R is the correct reason for A1.
• B. A1 is true and R is the correct reason for A1, but A2 is false.
• C. A1 and A2 both are incorrect, but R is true.
• D. A1, A2 and R are true but R is not the correct reason for either A1 or A2.

Answer 1

The correct option is A A1, A2 and R are true and R is the correct reason for A1.

Wings of a bat and a bird are analogous as they share a common function, but do not show a common structure or origin. In a bat, wings are only folds of skin between the digits whereas in birds, wings consist of feather all over it. This dissimilarity in the structure shows that they have not descended from a common ancestor with wings.

Forelimbs of a bat and a bird are homologous structures as they show structural similarity and are inherited from a common ancestor with forelimbs.