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(B) The structure marked as $X$ in the filamentous blue-green alga Nostoc is a heterocyst.Heterocysts are specialized,pale-yellow,thick-walled cells f

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Heterocysts - Nitrogen fixation

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(B) The structure marked as $X$ in the filamentous blue-green alga Nostoc is a heterocyst.Heterocysts are specialized,pale-yellow,thick-walled cells found in some cyanobacteria.They are the sites of nitrogen fixation,where the enzyme nitrogenase functions in an anaerobic environment to convert atmospheric nitrogen into ammonia,which is essential for the organism's growth.

The given figure shows the structure of filamentous blue-green algae,Nostoc,with a structure marked as $X$. Select the option which shows the correct identification of $X$ with its feature.

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