Assertion (A) In old persons, there is gradually weakening of immune system. Reason (R) It is because of degeneration of thymus gland.

Question

Assertion (A) In old persons, there is gradually weakening of immune system. Reason (R) It is because of degeneration of thymus gland. (A) If both A and R are true and R is the correct explanation of A. (B) If both A and R are true, but R is not the correct explanation of A. (C) If A is true, but R is false. (D) If A is false, but R is true

Tardigrade Admin · Accepted Answer

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
In old persons, there is gradually weakening of immune system because of degeneration of thymus gland. Thymus secretes a hormone named thymosin which stimulates the development of certain kinds of WBCs involved in generating immunity. It is prominent at the time of birth, but it gradually atrophies in adults and its disappearance causes ageing.

Q. Assertion (A) In old persons, there is gradually weakening of immune system. Reason (R) It is because of degeneration of thymus gland.

If both A and R are true and R is the correct explanation of A.

If both A and R are true, but R is not the correct explanation of A.

If A is true, but R is false.

If A is false, but R is true

Q. Assertion (A) In old persons, there is gradually weakening of immune system.
Reason (R) It is because of degeneration of thymus gland.