TREE DISEASES AND PESTS
COMMON TREE DISEASES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Stomatal closure is an example of what type of defence?
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Physical
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Passive Chemical
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Active Chemical
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None of the above
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Explanation:
Detailed explanation-1: -The opening and closing of stomata depend on the turgor pressure, caused by the osmotic flow of water in the guard cells. When the guard cells are turgid, they expand resulting in the opening of stomata. When the guard cells lose water, they become flaccid leading to stomatal closure.
Detailed explanation-2: -The opening and closing of stomata is known as stomatal movement. When guard cells are turgid, stomata open and when flaccid, stomata close. The outer wall (convex) of guard cell is thin and inner wall (concave) is thick.
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