Question

Select a set of homologous organs from the following: 
(A) Wings of a bat and wings of a butterfly
(B) Wings of a pigeon and wings of a bat
(C) Wings of a butterfly and wings of a pigeon
(D) Forelimbs of a duck, forelimbs of a cow and forelimbs of a lizard

Answer 1

The wings of bat and a butterfly are analogous organs. Wings of butterfly are extensions of integuments which is supported with few muscles, whereas wings of bat are actually skin folds stretched between elongated fingers.
The wings of pigeon and a bat are also analogous. Both are used for flying, but wings of bat are actually skin folds stretched between elongated fingers. The wings of pigeon, on the other hand, are formed of limb bones covered with flesh, skin and feathers.
The wings of a butterfly and a pigeon are analogous as they perform similar function, i.e. flying, but they are structurally different from each other. The wings of pigeon are formed of limb bones covered with flesh, skin and feathers, whereas the wings of butterfly are extensions of integuments which is supported with few muscles.
The forelimbs of a duck, a cow and a lizard are homologous organs. Though they perform different functions, yet they are similar in anatomical structure.

Hence, the correct answer is option (D).