Water reaches the top of a plant due to

Options

(a) root pressure
(b) capillarity
(c) transpiration
(d) diffusion

Correct Answer:

transpiration

Explanation:

Water is mainly absorbed by roots which goes upwards so as to replace water loss in transpiration and to be used in photosynthesis. This upward movement of water from roots to leaves through stem against force of gravity is called ascent of sap. Different theories have been put forward in support of ascent of sap. They include root pressure theory, capillary theory and transpiration pull theory . Root pressure is developed when rate of absorption is more than rate of transpiration and so water is pushed