TREE PHYSIOLOGY
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Under conditions of bright light, in which part of a transpiring plant would water potential be lowest?
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Xylem vessels in the leaves
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Xylem vessels in the roots
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Root hairs
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Spongy mesophyll of the leaves
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Explanation:
Detailed explanation-1: -Hence, the spongy mesophyll cells of the leaves will have the lowest water potential.
Detailed explanation-2: -Our results corroborate earlier predictions that most evaporation occurs from the epidermis at low light and moderate humidity but that the mesophyll contributes substantially when the leaf center is warmed by light absorption, and more so under high humidity.
Detailed explanation-3: -In a dry system, it can be as low as –2 MPa in a dry seed, and it is zero in a water-saturated system. The binding of water to a matrix always removes or consumes potential energy from the system.
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