Question

The given figure shows structure of forelimbs of different organisms which are labelled as P, Q, R and S. Which of the following is incorrect regarding this?

• A. Q and R both are adapted for the same function i.e., flying, thus they are analogous organs.
• B. P and S both have same basic structural plan, thus they are homologous organs.
• C. P and Q are adapted for different functions i.e., swimming and flying respectively thus they are analogous organs.
• D. None of the above.

Answer 1

Answer: (C)

P and Q are adapted for different functions i.e., swimming and flying respectively thus they are analogous organs.

Analogous organs show a superficial resemblance:

* Their internal structure is quite different. They develop in unrelated organisms.

* Stages in the development are different.

* They have similar functions.

* They have a dissimilar developmental pattern. They show convergent evolution.

Homologous organs are similar in embryology, anatomy, and genetics but they have different functions. P and Q are adapted for different functions hence, they are homologous organs and not analogous organs.