PLANTS
TRANSPORT IN PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Majority of water transport to fulfil needs of a plant is accomplished by root pressure.
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Effect of root pressure is observed at night and early morning when evaporation is low.
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It maintains the shape and structure of the plants by keeping cells turgid.
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It is responsible for cooling of leaf surfaces upto 10 to 15 degrees.
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Detailed explanation-1: -Thus the correct answer is option(B) All plants and in all seasons. Note: Root pressure is more common in spring seasons before the leaves grow and the rate of transpiration is rapid. The effects of root pressure can only be seen during the night and early morning, as the evaporation rate is very low.
Detailed explanation-2: -Which among the following statements are correct with respect to root pressure? Root pressure is generated in the roots and helps drive water in both directions.
Detailed explanation-3: -Root pressure is caused by the absorption of nutrients from the soil. The effect of root pressure is observed more at night or early in the morning since stomata are closed at night because of the absence of sunlight at night.
Detailed explanation-4: -Root pressure affects the plant only at night and in the early morning because the rate of evaporation is very low during these times.
Detailed explanation-5: -During the night, due to the unavailability of sunlight, transpiration does not occur and without the process of transpiration pull, water won’t be able to reach the leaves. This causes more pressure from roots to absorb water from the soil.