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Question

Coralloid roots of Cycas possess a symbiotic Algae. It is

A
Aulosira
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B
Spirogyra
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C
Ulothrix
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D
Anabaena
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Solution

The correct option is D Anabaena
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid, because of their irregular, beady appearance. The coralloid roots contain symbiotic Cyanobacteria (blue-green algae), which fix nitrogen and, in association with root tissues, produce such beneficial amino acids as asparagine and citrulline.
so, the correct answer is 'Anabaena'

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