Microbes in Human Welfare MCQs Mock Test of Class 12th Biology

Welcome to your Microbes in Human Welfare MCQs Mock Test of Class 12th Biology

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Question 1. Process of biogas production is

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Question 2. Biogas is produced by

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Question 3. Dragonflies are used to get rid of

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Question 4. A microbial biocontrol agent that can be used to control butterfly caterpillars is

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Question 5. A nitrogen fixing microbe associated with the fern Azolla in rice fields is

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Question 6. Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of

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Question 7. Which of the following is widely used as a successful biofertiliser in Indian rice field ?

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Question 8. Which of the following options incldes biofertilscrs ?

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Question 9. Which of the following is a non-symbiotic biofertiliser ?

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Question 10. Nitrogen fixation in root nodules of Alnus is brought about by

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Question 11. The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is (a) vitamin C (b) vitamin D (c) vitamin B12 (d) vitamin E

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Question 12. Wastewater treatment generates a large quantity of sludge, which can be treated by

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Question 13. Methanogenic bacteria are not found in

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Question 14. The primary treatment of wastewater involves the removal of

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Question 15. BOD of wastewater is estimated by measuring the amount of

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Question 16. Which one of the following alcoholic drinks is produced without distillation ?

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Question 17. The free-living fungus Trichoderma can be used for

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Question 18. Mycorrhiza does not help the host plant in

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Question 19. Which one of the following is not a nitrogen-fixing organism ?

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Question 20. Which of the following microbes is a proteinacious infectious agent ?

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Question 21. The nutritive medium for growing bacteria and many fungi in laboratory is called

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Question 22. The inoculum is added to the fresh milk in order to convert milk into curd, the term ‘inoculum’ here refers to

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Question 23. Which of the following organisms is used in the production of beverages ?

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Question 24. Which of the following options contains the end products formed during anaerobic respiration in yeast ?

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Question 25. The chemical substances produced by some microbes which can kill or retard the growth of other microbes are called

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Question 26. Antibiotics are obtained from

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Question 27. Which of the following antibiotics was extensively used to treat American soldiers wounded in World War 11 ?

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Question 28. Streptomycin is obtained from

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Question 29. Integrated Pest Management (IPM) discourages the excessive used of

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Question 30. Which of the following is not used as a biopesticide ?

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Question 31. Organic farming does not include

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Question 31. Organic farming includes

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Question 32. Living organisms used to enrich the nutrient quality of the soil are called as

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Question 33. Biofertilisers are

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Question 34. Biofertilisers are the living organisms which

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Question 35. Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollition ?

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Question 36. Methanogens, growing anaerobically on cellulosic material produce

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Question 37. Which of the following bacteria is present in the rumen of cattle ?

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Question 38. Bacillus thuringiensis is used to control

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Question 39. Bacillus thuringiensis (Bt) strains have been used for designing novel

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Question 40. Which one of the following can be used as biofertiliser in cotton field ?

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Question 41. The symbiotic association between fungi and roots of higher plants is referred to as

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Question 42. Cyanobacteria are

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Question 43. Enzyme which has the fibrinolytic effect is

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Question 44. Statins used for lowering blood cholesterol level are extracted from

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Question 45. Monascus purpureus is a yeast commercially used in the production of

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Question 46 is the first step of sewage treatment.

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Question 47. During the primary treatment of sewage, solid particles that settle down are called

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Question 48. The purpose of biological treatment of waste water is to

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Question 49. The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as

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Question 50. BOD is………..in polluted water and in potable water.

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