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 Why are the stomata in most plants more numerous on the lower surface of a leaf instead of being on the upper surface ?

Stomata are more numerous on the lower side of the leaf to prevent transpiration. Transpiration is the loss of water through stomata, so, more stomata are found on the lower surface to prevent excessive loss of water. As the lower surface of leaf is not directly exposed to sun, rate is transpiration is low from the lower surface.

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 Stomata in most plants are more numerous on the lower surface of a leaf instead of being on the upper surface because the presence of stomata on lower surface will prevent excessive transpiration from taking place. The upper surface of the leaf faces the sun directly and if there would have been more stomata on the upper surface of the leaf then more transpiration would take place and plant may soon wilt and die.

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 The stomata in most plants are more numerous on the lower surface of a leaf instead of being on the upper surface to avoid excessive transpiration from taking place. The upper surface of the leaf faces the sun directly and if there would have been more stomata on the upper surface of the leaf than the lower surface then excessive transpiration would take place and plant may soon wilt and die.

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