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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