Question

Root hair absorb water from the soil on account of

• A. Turgor pressure
• B. Osmotic pressure
• C. Suction pressure
• D. Root pressure

Answer 1

The correct option is B Osmotic pressure

Plants absorb water through their root hairs. The cell wall of the root hair is permeable to water and minerals, but its cell membrane and the membrane around the vacuole form semi-permeable membranes. Soil solution is a weaker solution as compared to the cell sap of root hair. Because of this osmosis occurs and the water is absorbed by the root hairs through cell membranes from the soil. The cells of cortex have higher osmotic pressure which causes the diffusion of water from the root hair to cortical cells

So, the correct answer is 'Osmotic pressure'