Question

Plants do not use all the water they absorb from the soil. Much of it is given off by transpiration. Why then do the plants absorb so much water?

Answer 1

plants absorb water from soil by roots through xylem vessels.These xylem vessesl transports water from roots to shoot and here not all water is not used by plant.A process called transpiration occurs through stomata of leaves to create suction pull to enable plant to absorb water from soil.

Answer 2

Plants absorb minerals and nutrients from the soil in liquid form through Osmosis so they have to absorb much water even to take up small quantities of these nutrients.The excess of water is of no use for the plant so it gets rid of it through transpiration.