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MICROBES IN HUMAN WELFARE

1. Which of the following is not a function of LAB (Lactic Acid Bacteria)
1) LAB produces acids that coagulate and partially digest milk proteins.
2) LAB improves nutritional quality by increasing vitamin B12
3) It checks the disease causing microbes in our stomach
4) It is not a probiotic
A: 4 (It is not a probiotic)

 

2. The raising of dough in dosa and idli is due to
A. Respiration of bacteria
B. Fermentation caused by bacteria
C. Production of CO2 gas
A: ABC

 

3. The dough used for making bread is fermented using
A: Saccharomyces cervisiae

 

4. Fermenting sap from palms yields
A: Toddy

 

5. Which of the following cannot be fermented by microbes?
1) Fish                              2) Soya bean
3) Bamboo shoots             4) None of the above
A: 4 (None of the above)


6. Assertion (A): Swiss cheese has large holes.
   Reason (R): Propionibacterium sharmanii produces large amount of oxygen during fermentation.
A: Only A is true, R is false

 

7. Roquefort cheese cannot be ripened without fermented with
A: Fungi

 

8. In which of the following is the yeast Saccharomyces cervisiae used
A. Production of beverages like wine, beer, whisky etc.
B. Bread making
C. Fermenting malted cereals and fruit juices
D. Production of ethanol
A: ABCD

 

9. Which of the following is produced without distillation?
1) Wine         2) Whisky          3) Brandy         4) Rum
A: 1 (Wine)

 

10. With reference to human beings antibiotics means
A: Pro life

 

11. Alexander Flemming discovered penicillin while working on
A: Staphylococci bacteria

 

12. The potential of penicillin to be used as an effective antibiotic was established by
A: Ernest Chain and Howard Florey

 

13. Citric acid is produced by which of the following micro organisms
1) Aspergillus niger    2) Acetobacter aceti   3) Clostridium butylicum   4) Lactobacillus
A: 1 (Aspergillus niger)

 

14. The enzymes used in detergent formulations to remove oily stains from laundry are
A: Lipases

 

15. The enzymes used to clarify fruit juices
A: Proteases and pectinases

 

16. Clots from blood vessels of patients who have undergone myocardial infection can be removed by using
A: Streptokinin

 

17. Which of the following is true about cyclosporin A
1) It is a bioactive molecule
2) It is used as an immunosuppressive agent in organ transplant patients
3) It is produced by the fungus Trichoderma polysporum
4) All the above
A: 4 (All the above)

 

18. The blood cholesterol lowering statins are produced by
A: Yeast Monascus purpureus

 

19. The following debris during primary treatment of sewage is removed by
1) Sedimentation   2) Sequential filtration   3) Mechanical agitation   4) Anaerobic digestion
A: 2 (Sequential filtration)

 

20. The grit (soil and small pebbles) during primary treatment of sewage is removed by
A: Sedimentation

 

21. Masses of bacteria associated with fungal filaments to form mesh like structure are called
A: Flocs

 

22. The amount of O2 that would be consumed if all the organic matter in 1 litre of water were oxidised by bacteria is called
A: Biochemical oxygen demand

 

23. The BOD is
1) A measure of organic matter present in water
2) A measure of the rate of uptake of oxygen by microorganisms in a sample of water
3) BOD is directly proportional to the polluting potential of waste water
4) All the above
A: 4 (All the above)

 

24. Utilization of microbes to remove toxic substances such as oil or chemical spills released into the environment is called
A: Bio remediation

 

25. Bio gas contains a mixture of gases predominantly
A: Methane

 

26. Which of the following is true regarding methanogenic bacteria
A. They are found in anaerobic sludge during sewage treatment
B. They are present in rumen of cattle
C. They are present in human intestine
D. They help in breakdown of cellulose
A: ABD

 

27. The technology of Bio gas production was developed in India by
1) Indian Agricultural Research Institute
2) Khadi and Village Industries Commission
3) Indian Council of Agricultural Research
4) Both 1 and 2
A: 4 (Both 1 and 2)

 

28. Use of biological methods for controlling plant diseases and pests is called
A: Bio control

 

29. In view of organic farming the best way to control pests is
A: To keep them at manageable levels by a complex system of checks and balances

 

30. Red and black marked lady bird is used to get rid of
A: Aphids

 

31. The insects which are used to get rid of mosquitoes are
A: Dragon flies

 

32. The microbial bio control agent that can be introduced to control butterfly caterpillars is
A: Bacillus thuringiensis

 

33. An effective bio control agent of plant pathogens which lives in root ecosystems is
A: Trichoderma viridi

 

34. The best bio control agent to attack arthropod insects is
A: Baculo virus

 

35. Which of the following pairs are free living nitrogen fixers
1) Mycorrhizae and Azospirillum        2) Azospirillum and Azotobacter
3) Azotobacter and Rhizobium           4) Mycorrhizae and Azotobacter
A: 2 (Azospirillum and Azotobacter)

 

36. The Glomus fungus which is a best mycorrhizae former helps in absorption of
A: Phosphorus

 

37. Mycorrhizae are useful to the plant in the following ways
A. Absorption of phosphorus
B. Provide resistance to root borne pathogens
C. Provide tolerance to salinity and drought
D. Overall increase in plant growth and development
A: ABCD

 

38. Which of the following is not a nitrogen fixing cyano bacterium?
1) Anabaena          2) Nostoc           3) Oscillatoria         4) Chlorella
A: 4 (Chlorella)

 

39. The mutated pathogens are called
A: Super microbes

 

40. The use of or threat to use biological agents in order to spread fear or inflict disease and death upon large populations is called
A: Bio terrorism

 

41. Which of the following is not a re-emerging diseases presently
1) Cholera            2) TB        3) Dengue fever        4) SARS
A: 4 (SARS)

Posted Date : 30-11-2020