Question

Assertion (A): Animals recapitulate the biochemical aspects of their ancestors. 
Reason (R): Mammalian embryo first excretes urea, then uric acid and finally ammonia. 
 

• A. A and R are true. R is the correct explanation for A.
• B. A and R are true. But R is not the correct explanation for A.
• C. A is true. But R is false.
• D. A is false. But R is true.

Hint:

Understanding the biochemical pathways and their evolutionary significance can provide insights into the physiological processes of modern organisms.

Answer 1

The Correct Option is C

Assertion (A): The statement that animals recapitulate the biochemical aspects of their ancestors is true. This is a concept related to biochemical evolution, where certain biochemical pathways and processes in modern organisms reflect those of their evolutionary ancestors.

Reason (R): The statement that mammalian embryos first excrete urea, then uric acid, and finally ammonia is false. In reality, mammalian embryos primarily excrete urea, not uric acid or ammonia. The sequence described does not accurately reflect the excretory processes in mammalian embryos.

Thus, Assertion (A) is true, but Reason (R) is false.

Final Answer:
A is true, but R is false.