Plants can only utilise nitrogen for their survival.

free organic

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fixed organic

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fixed inorganic

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gaseous

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Solution

The correct option is C fixed inorganic
Plant cannot utilise the atmospheric nitrogen directly. Plant can assimilate nitrogen only in fixed inorganic forms like ammonia, nitrate or nitrite. The fixation of nitrogen can be done with the help of nitrogen fixing bacteria like Rhizobium. This relationship between plant and nitrogen fixing bacteria is known as symbiosis.

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