Microbes in Human Welfare MCQ Questions for Class 12 Biology Chapter 10 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Biology book Chapter 10 Microbes in Human Welfare with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Microbes in Human Welfare. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Biology

Q1. Which of the following is a non-symbiotic biofertiliser ?

(i) VAM
(ii) Azotobacter
(iii) Anabaena
(iv) Rhizobium

(ii) Azotobacter


Q2. Humulin is a

(i) Vitamin
(ii) Fat
(iii) Protein
(iv) Carbohydrates

(iii) Protein


Q3. The primary treatment of waste water involves the removal of

(i) dissolved impurities
(ii) stable particles
(iii) toxic substances
(iv) harmful bacteria.

(ii) stable particles


Q4. Methanogenic bacteria are not found in:

(i) rumen of cattle
(ii) gobar gas plant
(iii) bottom of water logged paddy fields
(iv) activated sludge.

(iv) activated sludge.


Q5. Term antibiotic was first used by :

(i) Flemming
(ii) Pasteur
(iii) Waksman
(iv) Lister

(iii) Waksman


Q6. Which of the following options incldes biofertilscrs ?

(i) cowdung manure and farmyard waste
(ii) A quick growing crop ploughed back into the field
(iii) Nostoc, Oscillatoria
(iv) All of these

(iii) Nostoc, Oscillatoria


Q7. The technology of biogas production was developed in India mainly due to the efforts of?

(i) ICRI and KVIC
(ii) IARI and KVIC
(iii) Pusa Agriculture
(iv) None of the above

(ii) IARI and KVIC


Q8. Bacillus thuringiensis is used to control

(i) fungal pathogens
(ii) nematodes
(iii) bacterial pathogens
(iv) insect pests.

(i) fungal pathogens


Q9. The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:

(i) Vitamin C
(ii) Vitamin D
(iii) Vitamin B12
(iv) Vitamin E.

(iii) Vitamin B12


Q10. Azoila has symbiotic relationship with:

(i) Chlotfila
(ii) Anabaena
(iii) Nostoc
(iv) Tolypothrix

(ii) Anabaena


Q11. Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of

(i) N2 fixing bacteria
(ii) N2 fixing cyanobacteria
(iii) mycorrhizae
(iv) all of these

(ii) N2 fixing cyanobacteria


Q12. Yeast is used in the production of

(i) Citric acid and lactic acid
(ii) Cheese and butter
(iii) Lipase and pectinase
(iv) Bread and beer

(iv) Bread and beer


Q13. Nitrogen fixation in root nodules of Alnus is brought about by

(i) Frankia
(ii) Azospirillum
(iii) Nostoc
(iv) Rhizobium

(i) Frankia


Q14. The primary treatment of waste water involves the removal of:

(i) dissolved impurities
(ii) stable particles
(iii) toxic substances
(iv) harmful bacteria.

(ii) stable particles


Q15. Nif gene occurs in:

(i) Peiiicillium
(ii) Rhizobium
(iii) Aspergillus
(iv) Streptococcus

(ii) Rhizobium


Q16. Which of the following options incldes biofertilscrs ?

(i) cowdung manure and farmyard waste
(ii) A quick growing crop ploughed back into the field
(iii) Nostoc, Oscillatoria
(iv) All of these

(iii) Nostoc, Oscillatoria


Q17. Which one of the following is not used in organic farming?

(i) Oscillatoria
(ii) Earthworm
(iii) Snail
(iv) Glomus

(iii) Snail


Q18. Which one of the following is not a nitrogenfixing organism?

(i) Anabaena
(ii) Nostoc
(iii) Azotobacter
(iv) Pseudomonas

(iv) Pseudomonas


Q19. Which one of the following alcoholic drinks is produced without distillation?

(i) Wine
(ii) Whisky
(iii) Rum
(iv) Brandy.

(i) Wine


Q20. Bacillus thuringiensis (Bt) strains have been used for designing novel:

(i) Bio-metallurigcal techniques
(ii) Bio-mineralization process
(iii) Bio-insecticidal plants
(iv) Bio-fertilizers

(iii) Bio-insecticidal plants


Q21. Nitrogen fixation in root nodules of Alnus is brought about by

(i) Frankia
(ii) Azorhizobium
(iii) Bradyrhizobium
(iv) Clostridium

(i) Frankia


Q22. Which one thing is not true about antibiotics?

(i) The term “antibiotic” was coined by Selman Waksman in 1942
(ii) First antibiotic was discovered by Alexander Flemming
(iii) Each antibiotic is effective only against one particular kind of germ
(iv) Some persons can be allergic to a particular antibiotic

(iii) Each antibiotic is effective only against one particular kind of germ


Q23. BOD of waste water is estimated by measuring the amount of

(i) total organic matter
(ii) biodegradable organic matter
(iii) oxygen evolution
(iv) oxygen consumption.

(iv) oxygen consumption.


Q24. The free-living fungus Trichoderma can be used for:

(i) killing insects
(ii) biological control of plant diseases
(iii) controlling butterfly caterpillars
(iv) producing antibiotics.

(ii) biological control of plant diseases


Q25. Citric acid is produced by:

(i) Rhizopus
(ii) Mucor
(iii) Aspergillus
(iv) Saccharomyces

(i) Rhizopus


Q26. Wastewater treatment generates a large quantity of sludge, which can be treated by

(i) anaerobic digesters
(ii) floe
(iii) chemicals
(iv) oxidation pond

(i) anaerobic digesters


Q27. Which of the following infectious disease cannot be controlled by antibiotics?

(i) Whooping cough
(ii) Diphtheria
(iii) Pneumonia
(iv) Common cold

(iv) Common cold


Q28. The residue left after methane production from cattle dung is

(i) burnt
(ii) burned in land fills
(iii) used as manure
(iv) used in civil construction.

(iii) used as manure


Q29. Mycorrhiza does not help the host plant in:

(i) Enhancing its phosphorus uptake capacity
(ii) Increasing its tolerance to drought
(iii) Enhancing its resistance to root pathogens
(iv) Increasing its resistance to insects.

(iv) Increasing its resistance to insects.


Q30. Usnic acid is an antibiotic obtained from :

(i) Fungi
(ii) Bacteria
(iii) Lichens
(iv) Algae

(iii) Lichens


Q31. Mycorrhiza does not help the host plant in

(i) enhancing its phosphorus uptake capacity
(ii) increasing its tolerance to drought
(iii) enhancing its resistance to root pathogens
(iv) increasing its resistance to insects

(iv) increasing its resistance to insects


Q32. The puffed-up appearance of dough is due to production of?

(i) SO2 gas
(ii) CO2 gas
(iii) Water vapour
(iv) O2 gas

(ii) CO2 gas


Q33. Cyanobacteria are used as biofertilisers because they

(i) are photosynthetic
(ii) grow easily anywhere
(iii) have mucilage
(iv) fix atmospheric nitrogen

(iv) fix atmospheric nitrogen


Q34. The residue left after methane production from cattle dung is:

(i) burnt
(ii) buried in land-fills
(iii) used as manure
(iv) used in civil construction.

(iii) used as manure


Q35. By anobacteria are useful biofertilizers in the; field of:

(i) Wheat
(ii) Maize
(iii) Rice
(iv) Sugarcane

(iii) Rice


Q36. Which one of the following is not a nitrogen-fixing organism ?

(i) Anabaena
(ii) Nostoc
(iii) Azotobacter
(iv) Pseudomonas

(iv) Pseudomonas


Q37. Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?

(i) Mustard gas
(ii) Propane
(iii) Laughing gas
(iv) Marsh gas

(iv) Marsh gas


Q38. Antibiotics are:

(i) Medicines
(ii) Toxin
(iii) Plants
(iv) Syrups

(i) Medicines


Q39. Which of the following microbes is a proteinacious infectious agent ?

(i) Fungi
(ii) Prions
(iii) Bacteria
(iv) Protozoa

(ii) Prions


Q40. Tissue plasminogen activator is

(i) An enzyme
(ii) A chemical that stimulates tissue differentiation
(iii) Amino acid
(iv) A Vitamin

(i) An enzyme


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Biology MCQs for Class 12 with Answers PDF

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