Question

How does transpiration help the roots absorb water and minerals from the soil?

Answer 1

• Root pressure is the pressure due to which water enters the xylem vessels.
• Whenever the xylem lay empty, e.g., during transpiration, the water from below rises into them by a capillary force.
• Water molecules are pulled up due to their tendency of remaining joined together (cohesion) and stick to the sides of the xylem vessels (adhesion).
• As a result of transpiration, a suction force is created in the xylem vessel. This force causes water to be pulled up from the xylem in the roots to the stem and leaves. This pulling force is called transpirational pull.