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InterviewSolution
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Which of the following theory gives the latest explanation for the closure of stomataA. ABA theoryB. Munch theoryC. Starch-glucose theoryD. Active `K^(+)` transport theory |
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Answer» Correct Answer - D Active `K^(+)` transport theory proposed by Levitt is the latest and most accepted theory for opening and closing of a stomata. According to this theory, pH of guard cells increase due to active `H^(+)` uptake by cell and `CO_(2)` assimilation by guard cell. Rise is pH of guard cell causes hydrolysis of strach to form phosphoenol pyruvate. Phosphoenol pyruvate combine with `CO_(2)` with the help of PEPase and forms oxalic acid, which gets changed into malic acid. `H^(+)` ions pass out of the guard cells, while `K^(+)` ions of epidermal cells pass into the guard cells `K^(+)` combine with malate. It results in absorption of water from adjacent cells, development of turgor and hence, opening of stomata. |
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