Question

Why the effect of root pressure in the transport of water is more important at night?

Answer 1

Root pressure:

1. It is the force that drives the fluid upward the conducting tissues.
2. It is the transverse osmotic pressure that develops in the cells of the roots.
3. It is a short-distance force and can not transport fluids up to great heights.

The effect of root pressure in the transport of water is more important at night as:

1. The stomata remain closed during the night time.
2. In all higher plants, the movement of water chiefly occurs due to root pressure and transpiration pull.
3. The transpiration pulls occurs more during the daytime as compared to the night time because the stomata are open during the day.
4. During the night, due to the unavailability of sunlight, transpiration does not occur and without the process of transpiration pull, water won't be able to reach the leaves.
5. This causes more pressure from roots to absorb water from the soil.