Heterocysts present in Nostoc are specialised for

Fragmentation

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Nitrogen fixation

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Storage

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Photosynthesis

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Solution

The correct option is B Nitrogen fixation
Nostoc is a cyanobacteria. It has ability to fix atmospheric nitrogen. It converts nitrogen into ammonia. The heterocysts present in it are specialized for nitrogen fixation. It contains enzyme nitrogenase. Nitrogenase is inactivated by oxygen. Hence, the heterocyst creates a microanaerobic environment.
Thus, the correct answer is 'Nitrogen fixation.'

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