HORTICULTURE SCIENCE
ULTRA STRUCTURE OF PLANT CELLS AND ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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rain does not run into the pore
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it is cooler on the lower side so there is less evaporation of water
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There is a higher contraction of carbon dioxide on the lower surface.
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None of the above
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Detailed explanation-1: -Lower surfaces are not directly exposed to sun. This tends to reduce excessive water loss. It is a beneficial adaptation to check water loss in plants. Thus, the underside of leaves have more stomata.
Detailed explanation-2: -All the surfaces of the leaf have some amount of stomata. Stomata are tiny pores present on the epidermis of a leaf that help in the exchange of gases and transpiration. Generally lower surface of the leaf has more number of stomata, especially in dicotyledons.
Detailed explanation-3: -Stomata are tiny holes found in the underside of leaves. They control water loss and gas exchange by opening and closing. They allow water vapour and oxygen out of the leaf and carbon dioxide into the leaf.
Detailed explanation-4: -If the stomata are present on the plant’s lower surface, they will be less exposed to the sun and more protected from the breeze. Transpiration is the loss of water through stomata, hence the lower surface has more stomata to prevent excessive water loss.