(A) In floating hydrophytes like $Nymphaea$ (water lily),the leaves float on the surface of the water. To facilitate gaseous exchange with the atmosph

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Adaxial (upper) surface of leaf

(A) In floating hydrophytes like $Nymphaea$ (water lily),the leaves float on the surface of the water. To facilitate gaseous exchange with the atmosphere,the stomata are restricted to the adaxial (upper) surface of the leaf,as the abaxial (lower) surface is in contact with water.