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

Question 1. Process of biogas production is

Question 2. Biogas is produced by

Question 3. Dragonflies are used to get rid of

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

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

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

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

Question 8. Which of the following options incldes biofertilscrs ?

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

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

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

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

Question 13. Methanogenic bacteria are not found in

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

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

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

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

Question 18. Mycorrhiza does not help the host plant in

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

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

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

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

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

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

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

Question 26. Antibiotics are obtained from

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

Question 28. Streptomycin is obtained from

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

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

Question 31. Organic farming does not include

Question 31. Organic farming includes

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

Question 33. Biofertilisers are

Question 34. Biofertilisers are the living organisms which

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

Question 36. Methanogens, growing anaerobically on cellulosic material produce

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

Question 38. Bacillus thuringiensis is used to control

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

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

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

Question 42. Cyanobacteria are

Question 43. Enzyme which has the fibrinolytic effect is

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

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

Question 46 is the first step of sewage treatment.

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

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

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

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