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Question

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


A
I, III, IV
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B
I, II, III, IV
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C
II, III, IV
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D
I, II, III
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Solution

The correct option is D I, II, III
Rhizobium is a symbiotic bacteria found in the root nodules of leguminous plants that has the ability to fix atmospheric nitrogen. Azospirillum and Azotobacter are free-living bacteria found in the soil. They also enrich the nitrogen content of the soil.
Lactobacillus or Lactic acid bacteria grow in milk to convert it into curd.

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