GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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decrease in photosynthesis
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decrease in transpiration
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increase in photosynthesis
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increase in transpiration
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Detailed explanation-1: -Leaves in the form of spines mean that there is a lesser surface area of the leaf to lose water by transpiration. Thus, spines help them to reduce water loss.
Detailed explanation-2: -The leaves of cactus are modified into spines, to prevent water loss from the surface of leaves. The green stem of the cactus plant contains chlorophyll. Thus, the stem is the centre of photosynthesis in the cactus plants instead of the leaves. Q.
Detailed explanation-3: -In the desert, water is scarce. More leaves mean more stomata and more water loss through transpiration. If the plants have reduced leaves or no leaves at all, it will reduce the surface area and the number of stomata. Therefore, leaves in desert plants get modified into spines.
Detailed explanation-4: -Leaves are reduced to spines in order to reduce the loss of water from the surface of leaves.
Detailed explanation-5: -Leaves with spines have a smaller surface area, which means they lose less water through transpiration. As a result, spines assist them in reducing water loss.