Microbes: Household Products, Industrial Products and Sewage Treatment, Class 12 Biology NCERT Solutions

1. There will be total 10  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. The term antibiotic was first used by

  Pasteur

 Lister

 Waksman

 Flemming

Question 1 of 10

2. Lactic acid bacteria (LAB) grow in milk and convert it to curd and also improve its nutritional quality by increasing

  Vitamin C and A

 Vitamin B₆

 Vitamin A

 Vitamin B₁₂

Question 2 of 10

3. Methanogens growing anaerobically on cellulosic material produce

  Methane and hydrogen

 Methane and carbon dioxide

 Methane, carbon dioxide and hydrogen.

 Methane

Question 3 of 10

4. Maximum number of antibiotics are got from any group except for

 Fungi

 Viruses

 Eubacteria

 Actinomycetes

Question 4 of 10

5. Identify the fungus with medicinal importance.

  Agaricus

 Cercospora

 Saccharomyces

 Penicillium

Question 5 of 10

6. Which one of the following microbes is used in the commercial production of ethanol?

 Streptococcus spp.

 Clostridium butyricum

 Trichoderma polysporum

 Saccharomyces cerevisiae

Question 6 of 10

7. A sewage treatment process in which a part of the decomposer bacteria present in the wastes are recycled into the starting of the process is called

  Cyclic treatment

 Primary treatment

 Activated sludge treatment

 Tertiary treatment

Question 7 of 10

8. Probiotics are

 Live microbial food supplement

 New kind of food allergens

 Cancer inducing microbes

 Safe antibiotics

Question 8 of 10

9. Lactic acid is formed by the process of

  Fermentation

 Glycolysis

 HMP Pathway

 None of these

Question 9 of 10

10. Rennin used in the cheese industry is

 Alkaloid

 Enzyme

 Antibiotic

 Inhibitor

Question 10 of 10

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