MCQ Questions for Class 12 Biology: Ch 10 Microbes in Human Welfare

MCQ Questions for Class 12 Biology: Ch 10 Microbes in Human Welfare

1. Yeast is used in the production of
(a) Citric acid and lactic acid
(b) Cheese and butter
(c) Lipase and pectinase
(d) Bread and beer
► (d) Bread and beer

2. The term antibiotic was first used by
(a) Pasteur
(b) Lister
(c) Waksman
(d) Flemming
► (c) Waksman

3. Physical removal of large and small particle from the sewage through filtration and sedimentation is called?
(a) Primary treatment
(b) Tertiary treatment
(c) Secondary treatment
(d) Quaternary treatment
► (a) Primary treatment

4. The technology of biogas production was developed in India mainly due to the efforts of?
(a) ICRI and KVIC
(b) IARI and KVIC
(c) Pusa Agriculture
(d) None of the above
► (b) IARI and KVIC

5. Humulin is a_____.
(a) Vitamin
(b) Fat
(c) Protein
(d) Carbohydrates
► (c) Protein

6. Which one of the following is not used in organic farming?
(a) Oscillatoria
(b) Earthworm
(c) Snail
(d) Glomus
► (c) Snail

7. Human insulin is being commercially produced from a transgenic species of
(a) Escherichia
(b) Mycobacterium
(c) Rhizobium
(d) Saccharomyces
► (a) Escherichia

8. 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
(a) Cyclic treatment
(b) Primary treatment
(c) Activated sludge treatment
(d) Tertiary treatment
► (c) Activated sludge treatment

9. Which one thing is not true about antibiotics?
(a) The term “antibiotic” was coined by Selman Waksman in 1942
(b) First antibiotic was discovered by Alexander Flemming
(c) Each antibiotic is effective only against one particular kind of germ
(d) Some persons can be allergic to a particular antibiotic 
► (c) Each antibiotic is effective only against one particular kind of germ

10. Which of the following infectious disease cannot be controlled by antibiotics?
(a) Whooping cough
(b) Diphtheria
(c) Pneumonia
(d) Common cold
► (d) Common cold

11. Which of the following is pair of biofertilizers?
(a) Azolla and BGA
(b) Nostoc and legumes
(c) Rhizobium and grasses
(d) Salmonella and E. coli
► (a) Azolla and BGA

12. The puffed-up appearance of dough is due to production of?      
(a) SO2 gas
(b) CO2 gas
(c) Water vapour
(d) O2 gas
► (b) CO2 gas

13. Probiotics are
(a) Live microbial food supplement
(b) New kind of food allergens
(c) Cancer inducing microbes
(d) Safe antibiotics
► (a) Live microbial food supplement

16. Farmers have reported over 50% higher yields of rice by using the biofertilizer
(a) Azolla pinnata
(b) Cyanobacteria
(c) Legume-Rhizobium symbiosis
(d) Mycorrhiza
► (a) Azolla pinnata

17. The aquatic fern, which is an excellent biofertiliser is
(a) Azolla
(b) Salvinia
(c) Marsilia
(d) Pteridium
► (a) Azolla

18. Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?
(a) Mustard gas
(b) Propane
(c) Laughing gas
(d) Marsh gas
► (d) Marsh gas

19. Rennin used in the cheese industry is
(a) Alkaloid
(b) Enzyme
(c) Antibiotic
(d) Inhibitor
► (b) Enzyme

20. Organisms called Methanogens are most abundant in a____________.
(a) Cattle yard
(b) Sulphur rock
(c) Polluted water
(d) Hot spring
► (a) Cattle yard

21. Tissue plasminogen activator is_____.
(a) An enzyme
(b) A chemical that stimulates tissue differentiation
(c) Amino acid
(d) A Vitamin
► (a) An enzyme

22. Some hyperthermophilic organisms that grow in highly acidic (pH-2) habitats belong to the two groups
(a) Cyanobacteria and diatoms
(b) Protists and mosses
(c) Liverworts and yeasts
(d) Eubacteria and archaea
► (d) Eubacteria and archaea

23. Monascus purpureus is a yeast used commercially in the production of
(a) Blood cholesterol lowering statins
(b) Streptokinase for removing clots from the blood vessels
(c) Ethanol
(d) Citric acid
► (a) Blood cholesterol lowering statins

24. Which of the followings is also called sac fungi that live parasitically and in various habitats?
(a) Basidiomycetes
(b) Ascomycetes
(c) Phycomycetes
(d) Zygomycetes
► (b) Ascomycetes

25. Which of the following is likely to be achieved in the coming two decades?
(a) A complete understanding of the brainmind interaction
(b) Control of cancer
(c) Correction of genetic basis of diabetes mellitus
(d) Production of biodegradable plastic rather than cellulose by higher plants
► (b) Control of cancer

26. Which of the following is a gram-negative bacterium?
(a) Streptomyces coelicolor
(b) Escherichia coli
(c) Bacillus subtilis
(d) Amycolatopsis orientali
► (b) Escherichia coli

27. Agriculture by using only biofertilizers is called?
(a) Manuring
(b) Organic farming
(c) Inorganic farming
(d) Composting
► (b) Organic farming

28. Which one of the following is non-symbiotic biofertilizer?
(a) Azotobacter
(b) Anabaena
(c) Rhizobium
(d) VAM
► (a) Azotobacter

29. Methanogens growing anaerobically on cellulosic material produce
(a) Methane and hydrogen
(b) Methane and carbon dioxide
(c) Methane, carbon dioxide and hydrogen.
(d) Methane
► (c) Methane, carbon dioxide and hydrogen.

30. Symbiotic association of fungi with plant are called as
(a) Mycobacteria
(b) Mycovectro
(c) Mycorrhiza
(d) Lichens
► (c) Mycorrhiza

31. High value of BOD shows?
(a) Water is highly polluted
(b) Water is normal
(c) Water is less polluted
(d) None of the above
► (a) Water is highly polluted

32. Lactic acid is formed by the process of
(a) Fermentation
(b) Glycolysis
(c) HMP Pathway
(d) None of the above
► (a) Fermentation

33. Which one of the following plant is commonly used as green manure?
(a) Acacia nilotica
(b) Cassia fistula
(c) Crotalaria juncea
(d) Dalbergia sissoo
► (c) Crotalaria juncea

34. Maximum nutritional diversity is found in the group.
(a) Fungi
(b) Animalia
(c) Monera
(d) Plantae
► (c) Monera

35. Bioactive molecule that is used as an immunosuppressive agent in organ-transplant patient obtained from Trichoderma polysporum is
(a) Cyclosporine
(b) Cyclosporin A
(c) Tetracycline
(d) Homulin
► (b) Cyclosporin A

36. The amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria is called?
(a) Biochemical Oxygen demand
(b) Total oxygen demand
(c) Total organic demand
(d) Biological water demand
► (a) Biochemical Oxygen demand
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