Question

Assertion (A): Absorption of soil water by root is mostly an active process.

Reason (R): Most of the water is absorbed by the plants through osmotic mode that occurs due to concentration gradient and hence does not require metabolic energy.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

The assertion is false because the absorption of soil water by plant roots is mostly a passive process driven by transpiration pull, rather than an active one. The reason is true because the vast majority of water is absorbed passively via an osmotic mode along a concentration/water potential gradient, which relies entirely on physical forces and does not consume metabolic energy (ATP).