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Biofertilizers

Azotobacter i...

Question

Azotobacter is a-
nitrogen fixed bacteria
curd producingbacteria
bacteria used to produce alcohol
immunizing bacteria

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Solution

Azotobacter is a nitrogen fixing bacteria. It can fix atmospheric nitrogen to the soil and makes it available to the plants.

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Q. Match the columns and choose the correct answers

	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

Q. Assertion :Nitrate present in the soil is reduced to nitrogen by the process of denitrification. Reason: Denitrification is carried by bacteria Pseudomonas and Azotobacter.

Q. Which of the following bacteria help in nitrogen fixation from atmosphere.
I. Azotobacter II. Rhizobium III. Azospirillum IV. Lactobacillus

Q. Match the following.

(A) Nitrobacter	(i) Free living aerobic nitrogen fixing organism
(B) Clostridium	(ii) Converts nitrite to nitrates
(C) Nitrosococcus	(iii) Converts ammonia to nitrite
(D) Azotobacter	(iv) Free living anaerobic nitrogen fixing organism

Nitrogen fixing bacteria use oxygen for nitrogen fixation.

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