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Question

Which nitrogen fixing BGA is present in coralloid roots of Cycas?

A
Azolla
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B
Nostoc
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C
Anabaena
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D
Both b and c
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Solution

The correct option is D Both b and c
In addition to normal roots, Cycas also has apogeotropic, unbranched, coral-like roots called coralloid roots. The coralloid roots contain blue-green algae (BGA) like Nostoc and Anabaena which can fix atmospheric nitrogen.

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