Which one of the following is NOT a biofertiliser?

Rhizobium

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Azotobacter

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Mycorrhiza

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Agrobacterium

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Solution

The correct option is D
Agrobacterium

$∙$ Biofertilisers are defined as preparations containing cells of efficient strains of microorganisms that help crop plants uptake nutrients. Examples include the bacteria Rhizobium, Azotobacter, etc.
$∙$ Mycorrhiza is a fungus that is in a symbiotic association with roots of plants and it helps in the absorption of phosphates from the soil.
$∙$ Agrobacterium is a bacterium that causes tumours in plants and is therefore not a biofertiliser.

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