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Q.

Heterotrophic bacteria help in 

a. Curdling of milk

b. Production of antibiotics

c. Nitrogen fixation

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a

a only

b

a and b

c

a, b and c

d

b only

answer is B.

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Detailed Solution

Heterotrophic bacteria like

Lactobacillus helps in curdling of milk 

Rhizobium helps in fixation of nitrogen in legumes 

Bacillus species help in production of antibiotics. 

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