Question

17.
Paheli noticed water being pulled up by a motor-pump to an overhead tank of a five-storeyed building. She wondered how
water moves up to great heights in the tall trees standing next to the building. Can you tell why?​

Answer 1

Roots constantly absorb minerals and water from the soil. The suction force is created by evaporation of water from leaves. It helps water to move in the upper direction and reaches a great height in tall trees.

Answer 2

Water constantly evaporates from the leaves of the trees to form water vapour. This process is known as transpiration. This loss of water generates a “suction pull” which draws water up the tall trees.

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