Auxospores and heterocysts are formed respectively by

Some cyanobacteria and many diatoms

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Several cyanobacteria and several diatoms

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Some diatoms and several cyanobacteria

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Several diatoms and a few cyanobacteria

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Solution

The correct option is C Some diatoms and several cyanobacteria
Heterocysts are specialized nitrogen fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc and Anabaena.
When its size of a dividing diatom cell becomes too small, then it produces an auxospore to expand its cell size back to that of the normal vegetative cell.

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