Question
Biology Question on biological classification
A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is
A
Tolypothrix
B
Chlorella
C
Nostoc
D
Anabaena.
Answer
Anabaena.
Explanation
Solution
Anabaena is a free living nitrogen fixing cyanobacterium which can form symbiotic association with the water fern Azolla.