CLASS-XII BIOLOGY CHAPTER END TEST
CHAPTER-08: MICROBES IN HUMAN WELFARE
Q.1 | Which one of the following alcoholic drinks is produced without distillation? a. Wine b. Whisky c. Rum d. Brandy | 1M |
Q.2 | The free-living fungus Trichoderma can be used for: a. killing insects b. biological control of plant diseases c. controlling butterfly caterpillars d. producing antibiotics | 1M |
Q.3 | Mycorrhiza does not help the host plant in: a. Enhancing its phosphorus uptake capacity b. Increasing its tolerance to drought c. Enhancing its resistance to root pathogens d. Increasing its resistance to insects. | 1M |
Q.4 | Methanogenic bacteria are not found in: a. rumen of cattle b. gobar gas plant c. bottom of water-logged paddy fields d. activated sludge. | 1M |
Q.5 | Mention the source of Cyclosporin-A. Also mention the significance of this bioactive molecule. | 2M |
Q.6 | Explain the discovery of antibiotics in details. | 2M |
Q.7 | What do you understand by Biocontrol agents? Provide any two examples that explain the functioning of these agents. | 3M |
Q.8 | Biogas is one of the viable alternatives to the burning energy question. In 2014-15, about 20,700 lakh cubic meters of Biogas is produced in the country which is equivalent to 5% of the total LPG consumption in the country. The Government is also extending substantial subsidy for the setting up of new Biogas plants. It provides clean gaseous fuel for cooking and lighting. Chemical fertilizers can be done away with since the digested slurry obtained from the biogas plants can be used as enriched bio-manure. It is good for the climate and for sanitation problems since toilets can be linked directly with biogas plants. The given graph represents the production of biogas in a few states of our country.  Biogas is composed of mainly
a- Methane, CO2 and O2 b- CO2, H2S, H c- Methane, CO2 d- CO2, O2, H2S Which is the main component used by methane producing organisms
a- Proteins b- Cellulose c- Hemicellulose d- All of these In India the main institution for the development of biogas production is
a- NBRI b- IVRI c- KVIC d- KYC Assertion: Methanobactrium is a common methanogen.
Reason: These bacteria break down organic material and help in the digestion process of cattle. Both assertion and reason are correct and the reason is the correct
explanation of assertion. Both assertion and reason are correct and reason is not a correct
explanation of assertion. c- Assertion is true but the reason is false d- Assertion is false but the reason is true. | 4M |
Q.9 | Explain in details the mechanism of functioning of a sewage treatment plant. | 5M |
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