PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The humidity increases, which makes the rate of transpiration increase.
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The stomata open wider to let carbon dioxide into the leaf for photosynthesis
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The root hair become more permeable to water, letting more water into the plant and through the xylem
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The guard cells are sensitive to light and becomes turgid.
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Detailed explanation-1: -Light intensity: The transpiration rate is increased due to the increase in light intensity. 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.
Detailed explanation-2: -High light intensity during growth increased the stomatal frequency but there were only small changes in the length of the stomatal pore. High-light leaves had more than twice as many stomata per unit area as low-light leaves.
Detailed explanation-3: -Transpiration is closely related to stomata. Nearly 97 % of water from plants is lost through stomatal transpiration, so the more stomata, the higher the transpiration rate [3].
Detailed explanation-4: -Light induces the opening of stomata to enhance CO2 uptake, while drought causes stomata to close, thereby limiting water loss through transpiration. In nature, stomata will often receive both signals at the same time, as sunny periods frequently coincide with drought.
Detailed explanation-5: -[D] As light intensity decreases, the rate of transpiration increases because stomata are open in the light.