The ultimate source of nitrogen is

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(A) The atmosphere contains approximately $78\%$ nitrogen gas $(N_2)$. Although plants cannot directly utilize this atmospheric nitrogen, it serves as

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Atmospheric nitrogen

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(A) The atmosphere contains approximately $78\%$ nitrogen gas $(N_2)$. Although plants cannot directly utilize this atmospheric nitrogen, it serves as the primary reservoir from which nitrogen is fixed by biological and physical processes into forms that plants can absorb. Therefore, the atmosphere is considered the ultimate source of nitrogen.

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