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Assertion (A) : Nitrogen is an essential...

Assertion (A) : Nitrogen is an essential element for plant growth and is taken up by plants in the form of inorganic nitrates or nitrites.
Reason (R) : The soil is the nearest and richest source of raw materials like Nitrogen, Phosphorus and other minerals for the plants.

A

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

B

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

C

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

D

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

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Knowledge Check

  • Nitrogen, an essential element used in the synthesis of proteins , is obtained by plants in the form of

    A
    atmospheric nitrogen
    B
    nitrates and nitrites
    C
    amino acids
    D
    peptides

  • How is the nitrogen taken up by the plants? I. In the form of inorganic nitrates or nitrites II. In the form of organic compounds III. Directly taken up from the atmosphere

    A
    Only I and II
    B
    Only I and III
    C
    Only II and III
    D
    All I, II and III

  • Assertion (A) : Rhizobium leguminosarum is a symbiotic bacterium found in the root nodules of leguminous plants. Reason (R): They have the ability to fix atmospheric nitrogen.

    A
    Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
    B
    Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
    C
    Assertion (A) is true but reason (R) is false.
    D
    Assertion (A) is false but reason (R) is true.

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    Assertion :- In all plants Mo is essential for nitrogen metabolism. Reason:- In all plants it is constituent of nitrogenase enzyme so helps in nitrogen nutrition.

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