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Question

A prokaryotic organism possesses chlorophyll a, forms a gelatinous sheath around its colony and may fix atmospheric nitrogen in specialised cells. Which group does it belong to?

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Explanation

Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. Their colonies are generally surrounded by a gelatinous sheath, and some forms, such as Nostoc and Anabaena, fix atmospheric nitrogen in heterocysts.

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