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Q.

Which of the following cannot be absorbed by the plants directly from the atmosphere?

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a

Oxygen

b

Nitrogen

c

Carbon dioxide

d

All of these

answer is B.

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Detailed Solution

Nitrogen cannot be absorbed by plants directly from the atmosphere.
Nitrogen is an essential element for living organisms and plays an important role in regulating metabolism, growth, reproduction, and heredity. Plants require nitrogen to make plant proteins. But plants cannot use atmospheric nitrogen directly because it is present in the free gaseous form. Plants can only absorb nitrogen from the soil, which is present in the soil in the form of nitrogen compounds like nitrates and nitrites. The atmospheric nitrogen is converted into these compounds by the microorganisms in the soil.

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