Which of the following are bacterial biofertilisers?

Rhizobium

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Azotobacter

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Azolla

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Azospirillum

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Solution

The correct options are
A
Rhizobium

B
Azotobacter

D
Azospirillum

Microorganisms which help increase the soil fertility are called biofertilisers. The presence of these useful bacteria enhances the soil nutrients which are essential for plant growth. A few examples of bacterial biofertilisers are Rhizobium, Azotobacter and Azospirillum. Azolla is an aquatic plant that has a symbiotic relationship with a bacteria called Anabaena. When added to the soil, this association also increases soil fertility.

Suggest Corrections

	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

	List I		List II
A	Aerobic	1	Frankia
B	Non-photosynthetic bacteria	2	Azospirillum
C	Casuarina	3	Clostridium
D	Tropical grasses	4	Azotobacter