PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When sunlight needed
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When lack of Glucose
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When it loses water it closes and when it is filled with water it opens
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When it is cut
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Detailed explanation-1: -Thus, they close their stomata at night to prevent excess loss of water through them. Stomata can not be closed in the daytime, because the plant has to intake carbon dioxide for the process of photosynthesis. Guard cells imbibe water during the night time to become turgid and close the stomatal opening.
Detailed explanation-2: -Stomata provide for gas exchange and transpiration. Two guard cells that control the opening and shutting of the stomata surround it. For gaseous exchange and to release water vapor during transpiration, stomata open during the day. The change in the guard cell’s turgor pressure causes the stomata to open and close.
Detailed explanation-3: -The opening and closing of stomata are controlled by specialized cells called guard cells. The turgor pressure in the guard cells controls the opening and closing of the guard cells. Stomatal pores open when guard cells enlarge as a result of water absorption and close when guard cells shrink.
Detailed explanation-4: -Both of these predictions – stomatal closure and stomatal opening – are in fact correct: following an increase in water loss or a decrease in water supply, stomata transiently ‘pop open’ before eventually closing (e.g. Fig. 3).