Which of the cyanobacteria form heterocysts?
Oscillatoria
Nostoc
Anaebaena
Both B & C
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Heterocysts or heterocytes are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica.Nitrogen fixation in marine Oscillatoria appears to be associated with differentiated cells located in the center of the colony. ... These observations explain how Oscillatoria is able to fix N2 without heterocysts in an aerobic environment and why it blooms virtually always occur in calm seas.
option a
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