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Question

The association of Nitrogen fixing bacteria (nodule bacteria) with leguminous roots is known as

A
Saprophytism
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B
Symbiosis
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C
Epiphytism
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D
Parasitism
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Solution

The correct option is C Symbiosis
Symbiosis is a type of association of dissimilar organisms of their mutual advantage, e.g., association of nitrogen-fixing bacteria (nodule bacteria) with leguminous roots. The bacteria, inhabiting nodules on roots manufacture compounds from the nitrogen of the air, which becomes available to the plant. From the plant, bacteria obtain carbohydrates and other food materials.
So, the correct answer is 'Symbiosis'

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