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Question

Which one of nitrogen fixing bacteria form a symbiotic association with a gymnosperm roots ?

A
Nostoc
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B
Anabaena
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C
Rhizobiurn
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D
Aulosira
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Solution

The correct option is A Nostoc
The symbiotic association is seen between Nostoc and roots of cycad roots. Nostoc is also known as blue-green algae or cyanobacteria. It helps it by increasing the of nitrogen fixation.
Hence correct answer is option A .

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