Question
Medium
Solving time: 3 mins
Assertion: Normally in the day stomata are open during day time and closed during the night.
Reason: The change in the turgidity of the guard cells causes the opening or closing of stomata.
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Normally in the day time stomata are open and closed during the night. The immediate cause of the opening or closing of the stomata is a change in the turgidity of the guard cells. The inner wall of each guard cell, towards the pore or stomatal aperture, is thick and elastic. Within the two guard cells flanking each stomatal aperture or pore when turgidity increases, the thin outer walls bulge out and force the inner walls into a crescent shape, the opening of the stomata is also aided due to the orientation of the microfibrils in the cell walls of the guard cells. When the guard cells lose turgidity, due to water loss the elastic inner walls regain its original shape, the guard cells become flaccid and the stomata closes.
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Question Text | Assertion: Normally in the day stomata are open during day time and closed during the night. Reason: The change in the turgidity of the guard cells causes the opening or closing of stomata. |
Topic | Transport in Plants |
Subject | Biology |
Class | Class 11 |
Answer Type | Text solution:1 |
Upvotes | 126 |