Question

Root pressure is caused by

• A. Osmosis
• B. Diffusion
• C. Passive transport
• D. Uphill transport

Answer 1

The correct option is A Osmosis

Root pressure is caused in the Xylem vessels due to osmosis. It is a positive pressure which is developed due to Osmotic pressure which is high in the root as compared to the water column above.

Diffusion is a very slow process and hence plant do not just depend on it for the ascent of sap.

Since it is not occurring through specialised proteins or usage of energy, it is neither passive transport nor uphill transport

So the correct answer is 'Osmosis'.