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Describe the mechanism of passive water absorption.
Answer
Mechanism of passive water absorption: 

The water moves through the apoplast pathway in a passive way. The direction of the movement of water is according to the concentration gradient and hence no energy is required for the same. The water is absorbed in the following way -: 

1. Root hairs have low water potential as compared to the soil. Thus, root hairs absorb water from the soil.

2. The water from soil enters into root hairs due to osmosis.

3. The cortical cells just adjoining to epidermal cells with root hair have much more osmotic pressure than root hair cells. Thus, water from epidermal cells diffuses into cortical cells adjoining them. The water diffuses passively through the cortical cells until they reach the casparian stripe which are suberized.