Question

By which method is water absorbed by root hairs?

• A. Transfer
• B. Diffusion
• C. Osmosis
• D. Both (A) and (B)

Hint:

Osmosis is the passive movement of water from high concentration to low concentration across a semi-permeable membrane.

Answer 1

The Correct Option is C

Step 1: Role of Root Hairs:
Root hairs are thin-walled extensions of root epidermal cells. They increase surface area for water absorption from soil. Step 2: Mechanism:
Soil solution has higher water concentration (low solute).
Cell sap inside root hairs has lower water concentration (high solute).
Due to this concentration gradient, water moves from soil into root hairs through osmosis.
Step 3: Why Not Other Options?
Transfer → Not a scientific absorption method.
Diffusion → Applies to gases/solutes, but water absorption in plants occurs via osmosis.
Osmosis → Movement of water across a semi-permeable membrane, correct here.
Step 4: Final Answer:
Water is absorbed by root hairs through Osmosis.