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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Choose true and false statements from the following:
$I.$ Mycorrhizal association between fungus and root of plant $(Pinus)$ is often obligate.
$II.$ $Pinus$ and orchid seeds can germinate and grow into plant in absence of mycorrhizal association.
$III.$ Absorption of water along with mineral solute by root hairs is purely a process of diffusion.
$IV.$ In apoplast pathway,movement of water takes place through cell wall and intercellular spaces.
$V.$ Fungal hyphae provide sugar and organic internal to root.
Choose the correct option.
$I.$ Mycorrhizal association between fungus and root of plant $(Pinus)$ is often obligate.
$II.$ $Pinus$ and orchid seeds can germinate and grow into plant in absence of mycorrhizal association.
$III.$ Absorption of water along with mineral solute by root hairs is purely a process of diffusion.
$IV.$ In apoplast pathway,movement of water takes place through cell wall and intercellular spaces.
$V.$ Fungal hyphae provide sugar and organic internal to root.
Choose the correct option.
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Statement $I$: Xylem, i.e., the capillarity tube, must be with closed end walls and not hollow.
Statement $II$: The capillarity tube, i.e., xylem, is not in direct contact with soil water and contains a barrier of root cells between the xylem and soil water.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement $I$: Xylem, i.e., the capillarity tube, must be with closed end walls and not hollow.
Statement $II$: The capillarity tube, i.e., xylem, is not in direct contact with soil water and contains a barrier of root cells between the xylem and soil water.
In the light of the above statements, choose the most appropriate answer from the options given below:
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