Plants show temporary and permanent wilting. Differentiate between the two.
(N/A) Wilting is the loss of turgidity in plant leaves and stems, causing aerial organs to droop or fold. This occurs when the rate of transpiration exceeds the rate of water absorption.
| Temporary Wilting | Permanent Wilting |
|---|---|
| $(i)$ Occurs during the afternoon when the rate of transpiration is high. | $(i)$ Occurs when the soil moisture content falls below the permanent wilting percentage. |
| $(ii)$ Caused by a temporary imbalance where transpiration exceeds absorption. | $(ii)$ Caused by a severe, prolonged water deficit in the soil. |
| $(iii)$ The plant recovers its turgidity when water is added to the soil or transpiration decreases (e.g., at night). | $(iii)$ The plant cannot recover its turgidity even if water is added to the soil. |
| $(iv)$ The plant continues its normal growth after recovery. | $(iv)$ The plant eventually dies due to severe dehydration. |
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Which of the following statements are correct regarding the factors affecting the absorption of water by plants?
$(i)$ In plants,the rate of water absorption is minimum at a soil temperature of $20^{\circ}C$ to $30^{\circ}C$.
(ii) The presence of capillary water is essential in the soil.
(iii) Poorly aerated soil shows a poor absorption rate.
(iv) $A$ low transpiration rate accelerates the rate of absorption of water in irrigated soil.
$(v)$ $A$ high concentration of solutes in soil water reduces the rate of absorption of water.
$(i)$ In plants,the rate of water absorption is minimum at a soil temperature of $20^{\circ}C$ to $30^{\circ}C$.
(ii) The presence of capillary water is essential in the soil.
(iii) Poorly aerated soil shows a poor absorption rate.
(iv) $A$ low transpiration rate accelerates the rate of absorption of water in irrigated soil.
$(v)$ $A$ high concentration of solutes in soil water reduces the rate of absorption of water.
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