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Which of the ...

Question

Which of the following plant tissue of a tree has the lowest water potential?

A

Mesophyll of the upper most leaves

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B

Mesophyll of the leaves borne on shaded branches

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C

Xylem tissue of the main trunk

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D

Endodermal cells of the root

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Solution

The correct option is A Mesophyll of the upper most leaves
Water potential depends on the number or concentration of water molecules. More the number of water molecules in a system, higher will be the water potential. Water always flows from a region of higher to a region of lower water potential. In a plant, water moves from roots to leaves through xylem. Hence, leaves will have lower water potential than root cells or xylem. Water potential is decided by the relative concentration of water molecules in the system, not by exposure to light or darkness.
Thus, the correct answer is option A.

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