Identify the alga shown in the given figure.

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(B) The figure shows a filamentous cyanobacterium (blue-green alga) with specialized cells called heterocysts. Heterocysts are large,thick-walled cell

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Anabaena

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(B) The figure shows a filamentous cyanobacterium (blue-green alga) with specialized cells called heterocysts. Heterocysts are large,thick-walled cells specialized for nitrogen fixation. Among the given options,$Anabaena$ is a genus of filamentous cyanobacteria that possesses heterocysts. $Oscillatoria$ is a filamentous cyanobacterium but lacks heterocysts. $Batrachospermum$ is a red alga,and $Spirogyra$ is a green alga,neither of which matches the morphology shown in the figure.

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