A greater number of stomata on the lower surface of leaves demonstrates which ecological adaptation?

Correct answer: जल हानि को न्यूनतम करने का अनुकूलन (An adaptation to minimise water loss)

Correct answer: B, an adaptation to minimise water loss. Stomata are pores that allow carbon dioxide to enter and oxygen and water vapour to leave a leaf. The lower leaf surface is often cooler and receives less direct sunlight than the upper surface. Placing more stomata there can reduce the driving force for evaporation and therefore help limit transpiration, especially in many terrestrial plants. A is wrong because the position generally helps reduce unnecessary water loss rather than greatly increasing it, although stomata still permit gas exchange. C is wrong because stomata do not stop photosynthesis; carbon dioxide entering through them is needed for photosynthesis. D is wrong because stomatal distribution is a leaf adaptation and does not directly strengthen roots. This is a general pattern, not an absolute rule: aquatic plants and plants from different habitats may show different stomatal arrangements. Memory cue: shade and cooler lower surfaces help protect water; stomata still open when gas exchange is required.