Question

Why stomata is present on lower surface of leaf​

Answer 1

Answer:

Transpiration is the loss of water through stomata, so, more stomata are found on the lower surface to prevent excessive loss of water.

• Stomata present in the lower surface are not in direct contact with sunlight, so it opens less, and the rate of transpiration is reduced which prevents the water loss.
• Thus, a large amount of stomata is present at the lower surface of the dicot leaves.

Answer 2

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The reason that stomata are usually on the lower surface has been analysed in this paper, which rejects the commonly held hypothesis that stomata appear on the lower surface of leaves (hypostomatous) as a response to dryness, by citing that hypostomatous leaves are relatively less common in dry environments.