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Question
Choose the correct answers from the alternatives given.
The hormone that controls closure of stomata in response to water stress is
Choose the correct answers from the alternatives given.
The hormone that controls closure of stomata in response to water stress is
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Solution
The correct option is D Abscisic acid
As carbon dioxide is not utilised in photosynthesis during the night, hence its concentration in the substomatal cells increases. An inhibitor hormone, abscisic acid (ABA) functions in the presence of carbon dioxide. It inhibits potassium ions uptake by changing the diffusion and permeability of the guard cells for positive ions. The potassium ions are transported back to the epidermal cells of the guard cells thus closing of the stomata takes place.
Hence, the correct answer is 'Abscisic acid'.
As carbon dioxide is not utilised in photosynthesis during the night, hence its concentration in the substomatal cells increases. An inhibitor hormone, abscisic acid (ABA) functions in the presence of carbon dioxide. It inhibits potassium ions uptake by changing the diffusion and permeability of the guard cells for positive ions. The potassium ions are transported back to the epidermal cells of the guard cells thus closing of the stomata takes place.
Hence, the correct answer is 'Abscisic acid'.
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