An adaption for better gaseous exchange in plant leaves is

Hair on lower surface

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Multiple epidermis

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Waxy cuticle

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Stomata on lower surface away from direct sun rays

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Solution

The correct option is C Stomata on lower surface away from direct sun rays
Stomata are present on the lower side of the plant leaf, an adaptation for better gaseous exchange so that these stomata remain protected from direct sun rays there can be gaseous exchange without transpiration.
So, the correct answer is 'Stomata on lower surface away from direct sun rays'.

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