Question

Assertion (A): Kidneys eliminate urea and water only during excretion. 

Reason (R): Urea is the most poisonous, nitrogenous waste of the body, so it must be excreted out as early as possible.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(4)

Explanation:

Kidneys eliminate more than just urea and water. They also remove excess salts, uric acid, creatinine, and other metabolic wastes from the blood. Therefore, the Assertion (A) is false.

Urea is not the most poisonous nitrogenous waste. Ammonia is more toxic than urea. Urea is less toxic and can be transported in the blood to the kidneys for excretion. Therefore, the Reason (R) is also false.

Hence, both A and R are false.