Question

why the number of stomata present on upper surface of a leaf are comparetively
comparatively less than of the lower surface of leaf

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. Evaporation would mean the plant loses water, vital for life

Answer 2

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. Evaporation would mean the plant loses water, vital for life