2
Question
Assertion :Normally stomata are open in the day time and close during the night. Reason: The cause of the opening or closing of stomata is the change in the turgidity of the guard cells.
Assertion :Normally stomata are open in the day time and close during the night. Reason: The cause of the opening or closing of stomata is the change in the turgidity of the guard cells.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Normally stomata are open in the day time and close 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. When
turgidity increases within the two guard cells flanking each stomatal
aperture or pore, the thin outer walls bulge out and force the inner
walls into a crescent shape. The opening of the stoma is also aided due
to the orientation of the microfibrils in the cell walls of the guard
cells. When the guard cells lose turgor, due to water loss the elastic
inner walls regain their original shape, the guard cells become flaccid
and the stoma closes. So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.
Normally stomata are open in the day time and close 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. When turgidity increases within the two guard cells flanking each stomatal aperture or pore, the thin outer walls bulge out and force the inner walls into a crescent shape. The opening of the stoma is also aided due to the orientation of the microfibrils in the cell walls of the guard cells. When the guard cells lose turgor, due to water loss the elastic inner walls regain their original shape, the guard cells become flaccid and the stoma closes. So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.
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