MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare
Here we are providing MCQ questions for Class 12 Biology chapter 10 Microbes in human welfare. These questions are prepared by subject experts and is according to the latest syllabus. Students can practice these questions to score better marks in their exams. To check the answer just click on the ‘Answer‘ just below the question, it will expand and you will be able to check the answer.
Q.1. Which of the following microbe is made up of protein only?
(A) Virus (B) Bacteria (C) Viroid’s (D) Prions
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Answer: DQ.2. Trichoderma polysporum is a source of
(A) Cyclosporine – A (B) Streptokinase (C) Statins (D) Clot buster
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Answer: AQ.3. The product of Monascus purpureus has been commercialized as
(A) Immunosuppressive agent (B) Blood- cholesterol lowering agent
(C) Clot buster (D) Bottled juices clarifying agents
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Answer: BQ.4. The infectious agents made up of RNA only are
(A) Viroids (B) Bacteria (C) Fungi (D) Virus
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Answer: AQ.5. Microbial colonies
(A) Can be grown on nutritive media (B) Can be seen by naked eyes
(C) Are useful in study of microbes (D) More than one option is correct
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Answer: DQ.6. What is the beneficial role of LAB in our stomach?
(A) Causing souring of milk by decreasing nutritional quality
(B) Increases the amount of vitamin-D
(C) Checks disease causing microbes
(D) It produces alkali which coagulate and partially digest the milk proteins
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Answer: CQ.7. The microbe used for making bread is
(A) Saccharomyces cerevisiae (B) Saccharomyces ellipsoidens
(C) Saccharomyces pireformis (D) Saccharomyces sake
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Answer: AQ.8. Identify the colonies labelled as a and b
(A) a-Fungal; b-Bacterial (B) a-Bacterial; b-Fungal
(C) a-Algal; b-Viral (D) a-Fungal; b-Algal
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Answer: BQ.9. Which of the following microbe is used for ripening of Swiss cheese?
(A) Penicillium roquefortii (B) P. camembertii
(C) Propionibacterium sharmanii (D) Streptomyces griseus
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Answer: CQ.10. Production of beverages at industrial scale requires growing microbes in very large containers known as
(A) Digesters (B) Fermenters (C) Dough (D) Concrete tank
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Answer: BQ.11. Which of the following is traditional drink from some parts of southern India, made by fermenting sap from palms?
(A) Tea (B) Toddy (C) Beer (D) Cashew apple
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Answer: BQ.12. Which of the following microbe is the source of first antibiotic?
(A) Penicillium notatum (B) Staphylococci (C) Aspergillus niger (D) Bacillus brevis
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Answer: AQ.13. Brewer’s yeast is used for A of malted cereals and fruit juices to produce B_.
(A) A-Distillation; B- CO2 (B) A-Distillation; B- organic acid
(C) A-Fermentation; B- CO (D) A-Fermentation ; B-Alcohol
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Answer: DQ.14. The chemicals which are “pro-life” with reference to human beings
(A) Are regarded as one of the most significant discovery of twenty first century
(B) Have rarely contributed to human welfare
(C) Are produced by some plants and all animals
(D) Can kill or retard the growth of disease-causing microbes
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Answer: DQ.15. The first antibiotic was discovered accidently by A while working on _B
(A) A-Waksman; B-Streptococcus (B) A-Fleming; B-Penicillium notatum
(C) A-Waksman; B-Bacillus brevis (D) A-Fleming; B-Staphylococci
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Answer: DQ.16. Find the one w.r.t. distilled alcoholic beverages
(A) Rum (B) Beer (C) Brandy (D) Whisky
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Answer: BQ.17. Commercial extraction of penicillin was done by
(A) Alexander Fleming (B) Emest Chain
(C) Howard Florey (D) More than one option is correct
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Answer: DQ.18. Identify the correct statements w.r.t. antibiotics
i. Fleming, Chain and Florey were awarded the Nobel Prize in 1945.
ii. Antibiotics have greatly improved our capacity to treat deadly diseases
iii. Penicillin was used to treat American soldiers wounded in World War I
(A) (i) and (ii) (B) (i) and (iii) (C) (ii) and (iii) (D) All are correct
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Answer: AQ.19. _______are used in detergent formulations and are helpful in removing oily stains from laundry.
(A) Ligases (B) Proteases (C) Lipases (D) Pectinases
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Answer: CQ.20. Select the microbe which is the source of ‘clot buster’ enzyme.
(A) Bacterium; Lactobacillus (B) Fungi; Aspergillus niger
(C) Fungi; Penicillium notatum (D) Bacterium; Streptococcus
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Answer: DQ.21. The bottled juices are clarified by the use of
(A) Pectinases (B) Proteases (C) Lipases (D) Both A & B
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Answer: DQ.22. Match the following (column – I with column – II)
(A) a(i), b(ii), c(iii), d(iv) (B) a(ii), b(i), c(iv), d(iii) (C) a(ii), b(iv), c(iii), d(i) (D) a(iii), b(i), c(iv),d(ii)
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Answer: BQ.23. ___ A ___ enzyme is used to remove clots from the blood vessels of patients who have undergone ___ B ___leading to heart attack.
(A) A-Streptokinase; B-Myocardial infraction (B) A-Lipases; B-Arteriosclerosis
(C) A-Proteases; B-Myocardial infraction (D) A-Pectinases; B-Atherosclerosis
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Answer: AQ.24. Identify the parts labelled as A, B, C and D
(A) Head, Neck, Collar, Tail (B) Capsule, Tail, Collar, Pins
(C) Head, Collar, Tail, Plate (D) Head, Tail, Collar, Prongs
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Answer: CQ.25. An immunosuppressive agent used in organ-transplant patients is
(A) Streptokinase (B) Statins (C) Cyclosporine-A (D) Lipases
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