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(D) Transpiration is the process of water loss from the aerial parts of plants in the form of water vapor.While several environmental factors such as

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Relative humidity

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(D) Transpiration is the process of water loss from the aerial parts of plants in the form of water vapor.While several environmental factors such as $Temperature$, $Light$, and $Wind$ influence the rate of transpiration, $Relative 	ext{ } humidity$ is considered the most critical factor.$Relative 	ext{ } humidity$ determines the water vapor pressure gradient between the leaf interior (sub-stomatal cavity) and the external atmosphere.When the $Relative 	ext{ } humidity$ is low, the air is dry, creating a steep diffusion gradient that facilitates rapid water loss.Conversely, high $Relative 	ext{ } humidity$ reduces this gradient, thereby significantly slowing down the rate of transpiration.

The factor, most important in regulating transpiration, is

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