📝 Multiple Choice Question
General-science
Which of the following is a 'Cyanobacterium' (Blue-green algae) used as a bio-fertilizer in paddy fields
A
Spirogyra
B
Anabaena
C
Chlamydomonas
D
Ulothrix
Explanation
Anabaena and Nostoc can fix atmospheric nitrogen in specialized cells called heterocysts.
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