Microbes in Human Welfare - NCERT Based MCQ Questions for NEET

This article contains NCERT based 45 MCQ questions test on Biology chapter "Microbes in Human Welfare". These questions are highly valuable for the NEET exam. You can attempt these questions in the form of an interactive quiz and calculate your score. Read the below quiz rules carefully before you start

General Instructions

• Quiz contains 45 questions of 4 marks each.
• Correct answer (✔) will award you +4 marks and Incorrect answer (✘) will give you -1 mark.
• Total test is of 180 marks.
• Tap on box in order to select any option that you think is correct.
• Press the Submit button given in the end of quiz to calculate your score.
• There is a PDF file attached in the end of quiz. You can see detailed solutions to all questions and do self analysis from that file as well.

Question 1. The puffed-up appearance of dough is due to fermentation by bacteria. Identify the gas liberated during the process.

(1) Hydrogen sulfide

(2) Methane

(3) Ammonia

(4) Carbon dioxide

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Question 2. Identify a micro-organism that can produce biomass of protein.

(1) Methylophilus methylotrophus

(2) Monoscus purpureas

(3) Trichoderma polysporum

(4) Aspergillus niger

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Question 3. Beer has an alcoholic content

(1) 3-6%

(2) 9-12%

(3) 40%

(4) 60%

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Question 4. Dr. Alexander Fleming observed inhibition zone around a blue mould in a contaminated Staphylococcus culture petri plate. This led to the discovery of

(1) antibiotics

(2) antitoxins

(3) antibodies

(4) antigens

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Question 5. Yeast is used in the production of

(1) bread and beer

(2) cheese and butter

(3) citric acid and lactic acid

(4) lipase and pectinase.

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Question 6. Ernst Chain and Howard Florey’s contribution was

(1) establishing the potential of penicillin as an effective antibiotic

(2) discovery of streptokinase

(3) production of genetically engineered insulin

(4) discovery of DNA sequence.

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Question 7. Select the incorrect match.

(1) Citric acid – Aspergillus niger

(2) Streptokinase – Streptococcus

(3) Butyric acid – Clostridium acetobutylicum

(4) Cyclosporin – Monascus purpureus

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Question 8. Which of the following microbes is used for the commercial production of ethanol?

(1) Clostridium butylicum

(2) Trichoderma polysporum

(3) Monascus purpureus

(4) Saccharomyces cerevisiae

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Question 9. A person admitted to hospital as he had myocardial infarction. A cardiologist injected him ‘streptokinase’, why?

(1) It stimulates heart beat.

(2) It reduces hypertension.

(3) It acts as clot buster.

(4) It reduces the level of blood cholesterol

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Question 10. Which antibiotic has bactericidal effect?

(1) Erythromycin

(2) Penicillin

(3) Streptomycin

(4) Chloramphenicol

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Question 11. Select the correct pair of microorganism and the product obtained from it.

(1) Monascus purpureus - produces large holes in Swiss cheese.

(2) Saccharomyces cerevisiae - used for making wine and beer after distillation.

(3) Streptococcus - produces streptokinase which is used to remove clots.

(4) Aspergillus niger - produces citric acid and butyric acid.

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Question 12. Wine and beer are produced directly by fermentation whereas brandy and whisky require both fermentation and distillation. This is because

(1) fermentation is inhibited at an alcohol level of 10-18%

(2) distillation prolongs storage

(3) distillation improves quality

(4) distillation purifies the beverage

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Question 13. Yeast is used for commercial production of

(1) methanol

(2) ethanol

(3) butanol

(4) citric acid

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Question 14. Microbe used as ‘clot buster’ during myocardial infarction

(1) Penicillium notatum

(2) Clostridium butylicum

(3) Streptococcus

(4) Acetobacter aceti

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Question 15. Aspergillus niger is used for commercial and industrial production of

(1) acetic acid

(2) butyric acid

(3) citric acid

(4) lactic acid

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Question 16. Statin, a blood-cholesterol lowering agent, is commercially obtained from

(1) Trichoderma polysporum

(2) Acetobacter aceti

(3) Clostridium butyricum

(4) Monascus purpureus

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Question 17. Microorganism used for commercial production of acetic acid is

(1) Saccharomyces cerevisiae

(2) Aspergillus niger

(3) Acetobacter

(4) Clostridium butylicum

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Question 18. ‘Roquefort cheese’ is ripened by using a

(1) bacterium

(2) type of yeast

(3) cyanobacteria

(4) fungus

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Question 19. Cyclosporin A, which is used as an immunosuppressive agent, is produced by

(1) Aspergillus

(2) Clostridium

(3) Saccharomyces

(4) Trichoderma

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Question 20. Flemming, Chain, and Florey were awarded the Nobel Prize in 1945 for the discovery of

(1) HIV

(2) CT scan

(3) penicillin

(4) Staphylococcus

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Question 21. Which among these are produced by distillation of fermented broth?

i) Whisky

ii) Wine

iii) Beer

iv) Rum

v) Brandy

(1) ii and iii alone

(2) i and ii alone

(3) iii and v alone

(4) i, iv and v alone

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Question 22. Select the correct statement.

(1) Acetobacter aceti produces citric acid.

(2) Saccharomyces cerevisiae is used as clot buster.

(3) Penicillium notatum restrict the growth of Staphylococci.

(4) Methanogens are found in aerobic conditions

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Question 23. Match the microbes in column I with their commercial/industrial products in column II and choose the correct answer.

Column I	Column II
A. Aspergillus niger	1. Ethanol
B. Clostridium butylicum	2. Statins
C. Saccharomyces cerevisiae	3. Citric acid
D. Trichoderma polysporum	4. Butyric acid
E. Monascus purpureus	5. Cyclosporin A

(1) A-4, B-5, C-2, D-1, E-3

(2) A-5, B-4, C-1, D-2, E-3

(3) A-3, B-4, C-1, D-5, E-2

(4) A-3, B-4, C-5, D-1, E-2

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Question 24. Cyc1osporin A an immunosuppressive drug is produced by

(1) Aspergillus niger

(2) Monascus purpureus

(3) Penicillium notatum

(4) Trichoderma polysporum

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Question 25. During sewage treatment biogas produced includes

(1) hydrogen sulfide, nitrogen, methane

(2) methane, oxygen, hydrogen sulfide

(3) methane, hydrogen sulfide, carbon dioxide

(4) hydrogen sulfide, methane, sulphur oxide

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Question 26. In anaerobic sludge digestion during secondary treatment of sewage, biogas is produced which is a mixture of

(1) methane and H₂S

(2) methane, H₂S and CO₂

(3) methane, H₂S, CO₂ and CO

(4) methane, H₂S, CO₂, CO and ethane.

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Question 27. Which of the following is used as bioinsecticide?

(1) Bacillus polymyxa

(2) Cylindrospermum licheniforme

(3) Phytophthora palmivora

(4) Chrysanthemum cinerarifolium

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Question 28. Which of the following is a microbial biocontrol agent?

(1) Trichoderma

(2) Clostridium

(3) Bacillus thuringiensis

(4) Saccharomyces

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Question 29. The microbial biocontrol agent for butterfly caterpillar is

(1) Bacillus thuringiensis

(2) Saccharomyces

(3) Lactobacillus

(4) Cyanobacteria

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Question 30. Select the wrong statement.

(1) Human insulin is being commercially produced from a transgenic species of Escherichia coli

(2) The genetically modified Bacillus thuringiensis is used as biopesticide on the commercial scale

(3) Human protein, alpha-1-antitrypsin is used to treat emphysema

(4) Bt toxin genes cryIAc control the corn borer

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Question 31. Which one of the following statements is wrong in relation to transgenic Bt cotton plant?

(1) Crop yield loss due to attack by Bacillus thuringiensis bacterium is reduced.

(2) Crop yield loss due to attack by lepidopteran insect pests is reduced.

(3) The use of chemical insecticides in the cotton field is minimised.

(4) Better quality cotton is produced.

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Question 32. Microbe used for biocontrol of pest butterfly caterpillars is

(1) Saccharomyces cerevisiae

(2) Bacillus thuringiensis

(3) Streptococcus sp.

(4) Trichoderma sp.

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Question 33. The biological control of agricultural pests, unlike chemical control is

(1) very expensive

(2) polluting

(3) self perpetuating

(4) toxic

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Question 34. Which of the following is an example of biological control agents?

(1) NAA

(2) NPV

(3) Nostoc

(4) Agent orange

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Question 35. Which one of the following insecticides is of plant origin?

(1) Ecdysone

(2) Rotenone

(3) Parathion

(4) Malathion

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Question 36. Which one of the following insecticides is of plant origin?

(1) Ecdysone

(2) Rotenone

(3) Parathion

(4) Malathion

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Question 37. Due to which of the following organisms, yield of rice is increased?

(1) Sesbania

(2) Bacillus popilliae

(3) Anabaena

(4) Bacillus subtilis

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Question 38. Free living bacteria that can fix N₂ from soil is

(1) Clostriduim

(2) Azotobacter

(3) Beijerinckia

(4) all of these

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Question 39. Match the items in column I with those in column II and choose the correct answer.

P. Blue green algae as biofertilisers	i. Ectomycorrhiza
Q. Fungi as biofertilisers	ii. Thiobacillus sp.
R. Free living nitrogen fixing bacteria	iii. Anabaena sp.
S. Phosphate solubilising	iv. Clostridium sp.
	v. Azospirillum sp.

(1) P-iii, Q-i, R-v, S-ii

(2) P-v, Q-i, R-ii, S-iv

(3) P-v, Q-iv, R-i, S-ii

(4) P-iv, Q-ii, R-v, S-i

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Question 40. The main sources of biofertilizers are

(1) bacteria

(2) cyanobacteria

(3) fungi

(4) all of these

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Question 41. Which one of the following is a bacterial biofertilizer?

(1) Anabaena

(2) Nostoc

(3) Rhizobium

(4) Oscillatoria

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Question 42. Which one of the following pairs is not correctly matched?

(1) Streptomyces Antibiotic

(2) Serratia Drug addiction

(3) Spirulina Single cell protein

(4) Rhizobium Biofertilizer

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Question 43. Which of the following is a pair of biofertilizer?

(1) Nostoc and legume

(2) Rhizobium and grasses

(3) Azolla and blue green algae

(4) Salmonella and Escherichia coli

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Question 44. Which of the following is widely used as a successful biofertilizer in Indian rice field?

(1) Rhizobium

(2) Acacia arabica

(3) Acalypha indica

(4) Azolla pinnata

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Question 45. A good example of organic fertilizer which improves phosphorus uptake is

(1) actinomycetes fungi

(2) Rhizobium

(3) Azospirillum

(4) none of these

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Detailed Solutions

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