These questions consist of two statements each, printed as Statement-I and Statement-II. While answering these questions, you are required to choose any one of the following four responses.
Statement-I: In isobilateral leaves, the mesophyll differentiates extensively into palisade and spongy parenchyma, which is evident from its anatomical structure.
Statement-II: Bulliform cells in grasses respond to water stress by expanding, which subsequently causes the leaf to roll outwards, thereby maximizing water exposure.
Text Solution
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(b)
Statement I is incorrect because isobilateral leaves (commonly found in monocots) typically do not differentiate extensively into palisade and spongy parenchyma. Instead, the cells are more uniformly chlorenchymatous. Dorsiventral leaves (commonly in dicots) are the ones that differentiate into palisade and spongy parenchyma.
Statement II is the opposite of the actual behavior of bulliform cells. When these cells lose water and become flaccid due to water stress, they cause the leaf to curl inwards, thereby reducing water loss. However, the statement says the opposite, making it false.
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