Question

Assertion(A): Tail is present in the embryos of fishes and humans.
Reason(R): They evolved from a common ancestor.

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

Answer 1

The correct option is A Both A and R are true and R is correct explanation for A

$\bullet$ Embryos of various organisms like fish, pig, chick and human beings are very similar that it is difficult to distinguish from one another. They all have tails in the embryonic level.
$\bullet$ However, in humans, the tail gets reduced in later developement stages. The similarity in embryological level shows common ancestory in those organisms.