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Q.

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 
Assertion (A) : Water potential of endodermal cells of root is higher than root hairs
Reason (R) : Movement of water occurs from root hair to endodermis
In the light of the given statements, choose the correct answer from the options given. 

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a

Both A and R are correct, but R does not explain A

b

A is true, but R is false

c

Both A and R are correct, R explains A

d

A is false, but R is true

answer is C.

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Detailed Solution

Assertion (A) is false. The water potential of endodermal cells of the root is usually lower than that of the root hairs. Because of the presence of the Casparian strip, water and solutes must pass through the plasma membrane of endodermal cells before entering the xylem, which results in a decrease in water potential. In contrast, root hairs are specialized structures that increase the surface area of the root and facilitate the uptake of water and nutrients from the soil. The water potential of root hairs is typically higher than that of endodermal cells, as they are actively involved in the uptake of water and solutes.

Reason (R) is true. The movement of water actually occurs from the soil into the root hair cells, and then across the root cortex towards the endodermis and ultimately into the xylem for transport to the rest of the plant.

A is false, but R is true.

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