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Question

Root nodules are (i) ___ association, between (ii) ___

A
(i) Mutualistic (ii) leguminous plant and rhizobium
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B
(i) Commensalistic (ii) leguminous plant and rhizobium
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C
(i) Parasitic (ii) plant and fungi
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D
(i) Parasitic (ii) leguminous plant and algae
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Solution

The correct option is A (i) Mutualistic (ii) leguminous plant and rhizobium
Root nodules are mutualistic association, that is an interaction where both partners benefit, between a leguminous plant and a rod shaped bacteria present in soil called rhizobium. The rhizobium assists the plant in nitrogen fixation and in return the plant serves as a host for the bacteria providing shelter and nourishment.

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