Assertion :Excess of nitrogen if supplied to the plants is not beneficial to them. Reason: It reduces shoot/root ratio.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
C.
Excess use of nitrogen causes luxuriant growth in plants which increases the susceptibility of that plant to insects and pathogens. Excessive growth can also reduce the stem strength. It has other negative implication on environment and generate lower farm profits.
On the other hand, shoot/root ratio of a plant is reduced due to the the exposure of large amount of carbon dioxide.

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