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Which among the following does not come under the category of internal factors affecting transpiration?

(a) Sunken stomata

(b) Thick cuticle

(c) Light

(d) Water content of the leaves

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Correct option is (c) Light

Light is an external factor that affects transpiration. Light increases the rate of transpiration because in light, stomata are open. In dark, due to the closure of stomata, stomatal transpiration is almost stopped.

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