why more stomata are present below portion of leaf than upward part?
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Because in the lower portion the cells are in shade..hence transpiration is less....
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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.
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