In guard cells, when sugar is converted into starch, the stomatal pore

Closes completely

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Opens partially

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Opens fully

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Remains unchanged

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Solution

The correct option is C Closes completely
According to Lloyd stomatal movement occurs due to interconversion of starch and sugar, in the condition of water stress or during the absence of sunlight, sugar is converted into starch in the presence of some enzymes. Due to loss of starch from guard cells, these cells become shrink results into the closing of stomata.
So the correct answer is 'Closes completely'.

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