Microbes in Human Welfare Book Back Practice Test

12th Standard Zoology — Microbes in Human Welfare: Book Back Online Practice Test

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Which of the following microorganism is used for production of citric acid in industries?

A.Lactobacillus bulgaris B.Penicillium citrinum C.Aspergillus niger D.Rhizopus nigricans

Which of the following pair is correctly matched for the product produced by them?

A.Acetobacter aceti - Antibiotics B.Methanobacterium - Lactic acid C.Penicilium notatum - Acetic acid D.Saccharomyces cerevisiae - Ethanol

The most common substrate used in distilleries for the production of ethanol is_________

A.Soyameal B.Groundgram C.Molasses D.Corn meal

Cyclosporin - A is an immunosuppressive drug produced from _______

A.Aspergillus niger B.Manascus purpureus C.Penicillium notatum D.Trichoderma polysporum

CO2 is not released during

A.Alcoholic fermentation B.Lactate fermentation C.Aerobic respiration in animals D.Aerobic respiration in plants

The purpose of biological treatment of waste water is to _______

A.Reduce BOD B.Increase BOD C.Reduce sedimentation D.Increase sedimentation

The gases produced in anaerobic sludge digesters are

A.Methane, oxygen and hydrogen sulphide. B.Hydrogen sulphide, methane and sulphur dioxide. C.Hydrogen sulphide, nitrogen and methane. D.Methane, hydrogen sulphide and CO2.

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This free online practice test covers Microbes in Human Welfare from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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