Question

In actively transpiring plants, the theory which applies to the absorption mechanism of water is

• A. Osmotic theory
• B. Non osmotic theory
• C. Active theory
• D. Passive theory

Answer 1

Answer: (A)

Osmotic theory

In actively transpiring plants, the water is absorbed by roots through the process of osmosis and is lifted up through the cohesion-adhesion and transpiration pull mechanism. Osmosis is the movement of water along the concentration gradient across the semipermeable membrane. The root hairs are unicellular extensions of root epidermis, which absorb water through osmosis.

So, the correct answer is 'Osmotic theory'