Q. No.The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:
| 1. | vitamin C | 2. | vitamin D |
| 3. | vitamin B12 | 4. | vitamin E |
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Wastewater treatment generates a large quantity of sludge, which can be treated by:
| 1. | anaerobic digesters | 2. | floc |
| 3. | chemicals | 4. | oxidation pond |
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Methanogenic bacteria are not found in:
1. rumen of cattle
2. gobar gas plant
3. bottom of water-logged paddy fields
4. activated sludge
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Match the following list of bacteria and their commercially important products:
| Bacterium | Product | ||
| A. | Aspergillus niger | i. | Lactic acid |
| B. | Acetobacter aceti | ii. | Butyric acid |
| C. | Clostridium butylicum | iii. | Acetic acid |
| D. | Lactobacillus | iv. | Citric acid |
Choose the correct match:
| A | B | C | D | |
| 1. | ii | iii | iv | i |
| 2. | ii | iv | iii | i |
| 3. | iv | iii | ii | i |
| 4. | iv | i | iii | ii |
Match the following list of bioactive substances and their roles:
| Bioactive | Substance Role | ||
| A. | Statin | i. | Removal of oil stains |
| B. | Cyclosporin A | ii. | Removal of clots from blood vessels |
| C. | Streptokinase | iii. | Lowering of blood cholesterol |
| D. | Lipase | iv. | Immuno-suppressive agent |
Choose the correct match:
| 1. | A-ii, B-iii, C-i, D-iv | 2. | A-iv, B-ii, C-i, D-iii |
| 3. | A-iv, B-i, C-ii, D-iii | 4. | A-iii, B-iv, C-ii, D-i |
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The primary treatment of wastewater involves the removal of:
| 1. | dissolved impurities | 2. | stable particles |
| 3. | toxic substances | 4. | harmful bacteria |
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The technology of biogas production from cow dung was developed in India largely due to the efforts of:
| 1. | Gas Authority of India |
| 2. | Oil and Natural Gas Commission |
| 3. | Indian Agricultural Research Institute and Khadi & Village Industries Commission |
| 4. | Indian Oil Corporation |
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The free-living fungus Trichoderma can be used for:
1. killing insects
2. biological control of plant diseases
3. controlling butterfly caterpillars
4. producing antibiotics
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Mycorrhiza does not help the host plant in:
| 1. | Enhancing its phosphorus uptake capacity |
| 2. | Increasing its tolerance to drought |
| 3. | Enhancing its resistance to root pathogens |
| 4. | Increasing its resistance to insects |
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Which one of the following is not a nitrogen-fixing organism?
| 1. | Anabaena | 2. | Nostoc |
| 3. | Azotobacter | 4. | Pseudomonas |
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