BIOLOGY Assertion (A) & Reason (B) MCQ

Both A and R are false.
Explanation: Homologous organs are those which have the same essential structure, which they inherit from common ancestors though they may be very differently modified in adaptation to different functions.

Fig. Homology in the forelimbs of seal, bird, bat, horse and man (apparently different but constructed on the same basic pattern).
For example - in case of whales hind limbs are only represented internally and are not apparent externally, the forelimbs modified into paddles and retain the bones of the shoulder, forearm, wrist and fingers all of which are enclosed in a finshaped sac; the head is fish-like but possesses all the mammalian bones. Analogous organs are those which have similar structure connected with similarity of function have superficial resemblance to one another, but are of unlike origin. For example, the wings of a bat and wings of a bird doing the same flying function possess superficial resemblances to each other.

Both (A) and (R) are true, but (R) is not the correct explanation of (A).
Explanation: Both (A) and (R) are true, but (R) is not the correct explanation of (A).

Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation: Assertion and reason both are correct statements and reason is correct explanation for assertion.

Both A and R are true and R is the correct explanation of A.
Explanation: Two children per couple holds good for zero population growth. But in large democratic countries like India, it will take a little more.