Assertion: Plant exhibits deficiency symptoms
Reason: It receives nutrients below critical concentration

Both assertion & reason are correct and the reason is the correct explanation of assertion.

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Both assertion & reason are correct but the reason is not the correct explanation of assertion.

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Assertion is correct but the reason is incorrect

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Both assertion & reason are incorrect

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Solution

The correct option is A Both assertion & reason are correct and the reason is the correct explanation of assertion.
Plants obtain the required mineral salts from the soil. However, the concentration of minerals in the soil may vary and the plants may receive very limited amount of the required mineral salts.

The level of concentration of any essential element below which the plants exhibit deficiency symptoms is considered as critical concentration.

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Critical Concentration

Standard XII Biology

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Assertion: Plant exhibits deficiency symptoms Reason: It receives nutrients below critical concentration

Assertion: Plant exhibits deficiency symptoms
Reason: It receives nutrients below critical concentration