Choose the correct answer from the alternatives given.
Which of the following asymbiotic free-living cyanobacteria is concerned with nitrogen fixation?

Tolypothrix

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Anabaenopsis

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Stigonema

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All of these

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Solution

The correct option is C All of these
D : All of these
Solution : All of the given asymbiotic free living cyanobacteria have heterocysts in their cells that help them to fix nitrogen from atmosphere.
So the correct answer is "All of these".

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Similar questions

	List I		List II
A	$A z o s p i r i l l u m$ and $A z o t o b a c t e r$	1	Free living nitrogen fixing bacteria
B	$G l o m u s$	2	Biological control tools
C	$A n a b a e n a$ and $N o s t o c$	3	Forms mycorrhiza
D	$N u c l e o p o l y h e d r o$ $v i r u s$	4	Symbiotic cyanobacteria

Which of the following is used as biofertilizer?
I. Cyanobacteria
II. Yeast
III. Symbiotic bacteria
IV. Free living bacteria

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