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ICSE Class 9 Economic Important Of Bacteria MCQ HERE

Which of the following nitrogen fixing microorganisms is free living in soil?

Azatobacter

Nitrococcus

Pseudomonas

Rhizobia

In the nitrogen cycle, nitrite is converted to nitrate by ____.

azotobacter

nitrobacter

nitrosomonas

rhizobium

An undistilled alcoholic beverage produced from grain fermentation is

Whisky

Rum

Beer

Wine

The main gas produced in biogas plants due to bacterial actions is ____.

methane

hydrogen sulphide

carbon mono-oxide

carbon di-oxide

The process of biological nitrogen fixation was discovered by Dutch microbiologist Martinus Beijerinck.

True

False

The bulk of nitrogen in nature is fixed by symbiotic bacteria.

True

False

The antibiotic streptomycin was discovered by ____.

Waksman

Fleming

Salk

Sabin




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