OscillatoriaAnabaena and Nostoc are ________ which fix atmospheric nitrogen and improve soil fertility.

Fungi

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Free living bacteria

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Symbiotic bacteria

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Blue green algae

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Solution

The correct option is D
Blue green algae

Various blue green algae like and increase the soil fertility by fixing atmospheric nitrogen.

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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 increase the fertility of soil ?

A. Lactobacillus bacteria B. Rhizobium bacteria C. Spirogyra algae D. Blue-green algae

(a) A and B (b) B and C (c) A and D (d) B and D

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