PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hot, humid with bright sunshine and still air
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Low humidity, hot, bright sunshine and windy
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Windy, hot, cloudy and humid
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Windy, bright sunshine, humid and cool
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Detailed explanation-1: -(a) A higher rate of transpiration is recorded on a windy day rather than on a calm day. Solution:-Transpiration. increases with the velocity of wind. If the wind blows faster, the water vapour released during transpiration is removed faster and the area outside the leaf does not get saturated with water vapour.
Detailed explanation-2: -Higher temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open, whereas colder temperatures cause the openings to close. Wind & air movement: Increased movement of the air around a plant will result in a higher transpiration rate.
Detailed explanation-3: -Temperature. A high temperature lowers the relative humidity and opens the stomata even in darkness. As a result, the rate of transpiration increases.
Detailed explanation-4: -During daytime in the sunlight, the rate of transpiration is faster. This is because the stomata remains open to allow the inward diffusion of carbon dioxide for photosynthesis. During dark, the stomata are closed, and hence transpiration hardly occurs at night.