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Levitt's expl...

Question

Levitt's explanation for stomatal action is due to

A

Increase in sugar content of guard cells.

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B

Decrease in pH value.

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C

Starch being converted into organic acids.

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D

Light causes opening and darkness closure.

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Solution

The correct option is C Starch being converted into organic acids.
According to Levitt theory, during day time starch is converted to organic acids. This causes increase in proton concentration. These protons are exchanged for potassium ions from surrounding subsidiary cells. The influx of potassium ions leads to inflow of water into guard cells, which become turgid and stomata open.

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