Question

Heterocysts, specialized for nitrogen fixation, occur in certain … .. [ BHU entrance ]
a) Red algae( batrachospermum)
b) Green algae ( Spirogyra)
c) Blue-green algae (Anabaena)
d) Brown algae ( Laminaria)
​

Answer 1

C) blue green. Algae

Answer 2

Hieee mate....

I think ans is...Blue green algae...

Hope it helps..