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Question

In Cycas, small specialised roots called coralloid roots are associated with

A
nitrogen fixing mycorrhiza
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B
nitrogen fixing cyanobacteria
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C
carbondioxide fixing cyanobacteria
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D
carbondioxide fixing mycorrhiza
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Solution

The correct option is B nitrogen fixing cyanobacteria
In some genera of gymnosperms, roots are associated with fungi or cyanobacteria. For example: In Cycas, small specialised roots called coralloid roots are associated with nitrogen fixing cyanobacteria while in Pinus, roots have fungal association in the form of mycorrhiza.

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