In the nitrogen cycle, atmospheric nitrogen is converted into

Ammonia.

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Protein.

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Urea.

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Carbon dioxide.

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DNA.

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Solution

The correct option is A Ammonia.
Nitrogen cycle includes the reduction of atmospheric nitrogen into biologically usable form ammonia.
Proteins are the polymer of amino acids while DNA is a polymer of deoxyribonucleotides.
Urea is a toxic excretory nitrogenous compound. Carbon dioxide does not contain the nitrogen atom.
Thus, the correct answer is A.

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Similar questions

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i. The nitrogen compounds from dead plants re-enter the soil after decomposition by bacteria and fungi.
ii. Once nitrogenous compound is formed, plants utilise it to form proteins.
iii. Certain bacteria in the soil convert the atmospheric nitrogen into compounds of nitrogen.
iv. Certain bacteria convert the compounds of nitrogen back to gaseous nitrogen.

Assertion : Nitrogen is an essential component of proteins, DNA and chlorophyll.
Reason : Plants and animals can utilize atmospheric nitrogen.

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