Most of the leaves have stomata on their lower surface to exchange the gases why do leaves of lotus and water lily have stomata on their upper surface?
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If it were like an ordinary leaf, it would have the majority of its stomata in the lower epidermis, pressed against the water's surface – they would be unable to absorb any carbon dioxide from the atmosphere. This arrangement – having all the stomata in the upper epidermis – permits the leaves to absorb carbon dioxide.
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