Which of the following algae is symbiotic and nitrogen fixing [Pb. PMT – McqOptions

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1.	Which of the following algae is symbiotic and nitrogen fixing [Pb. PMT 1999]
A.	Spirogyra
B.	Cladophora
C.	Anabaena
D.	Oedogonium
Answer» D. Oedogonium

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