The rate of transpiration directly depends on

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(D) The rate of transpiration is primarily determined by the difference in vapour pressure between the internal atmosphere of the leaf (sub-stomatal c

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Vapour pressure gradient

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(D) The rate of transpiration is primarily determined by the difference in vapour pressure between the internal atmosphere of the leaf (sub-stomatal cavity) and the external environment. This difference is known as the Vapour Pressure Gradient $(VPG)$. Even if the stomata are fully open,if the relative humidity of the external air is $100\%$,the vapour pressure gradient becomes zero,and no transpiration occurs. Thus,the vapour pressure gradient is the direct driving force for transpiration.

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