Describe mechanism of absorption of water.

1.	Describe mechanism of absorption of water.
Answer» 1. The absorption of water takes place by two modes, i.e. active absorption and passive absorption. 2. Passive absorption is the chief method of absorption (98%). 3. There is no expenditure of energy in passive absorption. 4. Transpiration pull is a driving force and water moves depending upon concentration gradient. Water is pulled upwards. 5. It occurs during daytime when there is active transpiration. 6. Active absorption occurs usually during night time as due to closure of stomata transpiration stops. 7. Water absorption is against D.ED. gradient, A.T.R energy is required which is available from respiration. 8. Active absorption may be osmotic or non- osmotic type. 9. For osmotic absorption root pressure has a role.

Answer»

1. The absorption of water takes place by two modes, i.e. active absorption and passive absorption.

2. Passive absorption is the chief method of absorption (98%).

3. There is no expenditure of energy in passive absorption.

4. Transpiration pull is a driving force and water moves depending upon concentration gradient. Water is pulled upwards.

5. It occurs during daytime when there is active transpiration.

6. Active absorption occurs usually during night time as due to closure of stomata transpiration stops.

7. Water absorption is against D.ED. gradient, A.T.R energy is required which is available from respiration.

8. Active absorption may be osmotic or non- osmotic type.

9. For osmotic absorption root pressure has a role.

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