Heterocysts and present in ______________.

Riccia

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Ulothrix

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Albugo

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Nostoc

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Solution

The correct option is D Nostoc
Heterocysts are the thick-walled cells formed in cyanobacteria (Nostoc) and are responsible for nitrogen fixation in the state of nitrogen starvation by the use of enzyme nitrogenase. These are specialized pale yellow structures which help in nitrogen formation during aerobic conditions.

The correct answer is D.

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