Given below are two statements. One is labelled Assertion(A) and the other is labelled Reason(R).
Assertion(A): The concentration of ions and other materials is significantly higher in vacuoles than in the cytoplasm.
Reason(R): Tonoplast facilitates the transport of several ions and other materials against concentration gradients into the vacuole.
In light of the above statements, choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

Both (A) and (R) are true but (R) is not the correct explanation of (A).

answer is A.

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Detailed Solution

A is true. Cell sap of vacuole consists of water, ions (such as potassium and chloride), sugars, organic acids, and various nutrients etc. The concentration of ions and other materials is more in vacuoles compared to cytoplasm.
R is also true. Since the tonoplast (membrane of the vacuole) allows various ions to enter the vacuole against a concentration gradient, we find more amount of solutes in the vacuole.
Hence, R explains A.

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