Welcome to your 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.