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Question

Which of the following nutrients is fixed by Rhizobium bacteria into the soil?

A
Potassium
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B
Phosphorus
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C
Calcium
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D
Nitrogen
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Solution

The correct option is D Nitrogen
Plants cannot absorb atmospheric nitrogen but can absorb and utilise it in its dissolved form like nitrates. Bacteria like Rhizobium absorb and convert the atmospheric nitrogen into soluble forms so that the plants can absorb it. This process is known as nitrogen fixation.

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