Question

y upper surface of the leaf has fewer stomata?

Answer 1

All surfaces of the leaf have some amount of stomata for regulating gas exchange for photosynthesis. However, the lower epidermis (the underside of the leaf) has more, because it is more often in the shade and so it is cooler, which means evaporation won't take place as much.

Answer 2

Lower surface of leaf had stomata for exchange of gases in plants and also for transpiration.

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