SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the main site of photosynthesis is the spongy mesophyll cells
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the lower surface has a thicker waxy cuticle than the upper surface
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palisade mesophyll cells are arranged far apart to create air spaces
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the lower surface contains more stomata than the upper surface
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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: -In most cases, the lower epidermis contains more stomata than the upper epidermis because the bottom of the leaf is cooler and less prone to water loss.
Detailed explanation-3: -Stomata are generally more numerous on the underside of leaves. They provide for the exchange of gases between the outside air and the branched system of interconnecting air canals within the leaf.
Detailed explanation-4: -The more number of stomata present at the lower surface of the dicot leaves than the upper surface of the leaves to prevent excess water loss.