Select the correct pair.

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(A) Option $A$ is correct. $Nostoc$ is a cyanobacterium (blue-green alga) that possesses specialized cells called heterocysts,which are responsible fo

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Nitrogen fixation - Nostoc

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(A) Option $A$ is correct. $Nostoc$ is a cyanobacterium (blue-green alga) that possesses specialized cells called heterocysts,which are responsible for nitrogen fixation.Option $B$ is incorrect because Dinoflagellates are protists,not viruses.Option $C$ is incorrect because $Paramoecium$ is a ciliated protozoan,not flagellated.Option $D$ is incorrect because $Penicillium$ is a multicellular fungus,whereas yeast is an example of a unicellular fungus.

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