What are nitrogen fixers? [2 MARKS]

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Solution

Definition: 2 Marks

Some bacteria and blue green algae are able to fix nitrogen from the atmosphere to enrich soil and increase its fertility. These microbes are commonly called biological nitrogen fixers.

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Name one 'bilogical nitrogen-fixer'.

	I		II
a	Free living aerobic nitrogen fixers	1	Anabaena and Nostoc
b	Anaerobic nitrogen fixers	2	Pseudomonas denitrificans and Thiobacillus denitrificans
c	Nitrogen fixing cyanobacteria	3	Nitrosomonas and Nitrococcus
d	Denitrifying bacteria	4	Azotobacter and Beijerinckia
e	Nitrifying bacteria	5	Rhodospirillum

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