Q. No.What is true regarding the activated sludge generated during the secondary treatment of sewage water?
I:
It is made up of aerobic bacteria that sediment down
II:
A large part of the activated sludge is pumped back into the aeration tank to serve as the inoculum.
III:
A minor part of the sludge is pumped into large tanks called anaerobic sludge digesters.
1. Only I 2. Only II and III 3. Only I and III 4. I, II and III
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What is incorrect regarding organic farming?
| 1. | It relies on controlling pests by natural predation rather than introduced chemicals. |
| 2. | A key belief of the organic farmer is that biodiversity furthers health. |
| 3. | Pests are totally eradicated. |
| 4. | Reduces dependence on toxic chemicals and pesticides. |
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Arbuscular mycorrhizas are formed only by fungi in the division:
| 1. | Ascomycota | 2. | Glomeromycota |
| 3. | Basidiomycota | 4. | Microsporidia |
In paddy fields, important biofertilizers are:
| 1. | Cyanobacteria | 2. | Rhizobium |
| 3. | Frankia | 4. | Glomus |
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Consider the two statements:
| I: | Indirectly, BOD is a measure of the organic matter present in the water. |
| II: | The greater the BOD of wastewater, the more its polluting potential. |
1. Both I and II are correct
2. Only I is correct
3. Only II is correct
4. Both I and II are incorrect
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A biological control being developed for use in the treatment of plant diseases is the fungus:
| 1. | Trichoderma | 2. | Pneumocystis |
| 3. | Claviceps | 4. | Epidermophyton |
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The large holes in ‘Swiss Cheese’ are due to the production of a large amount of carbon dioxide by:
1. Propionibacterium shermanii
2. Methylophilus methylotrophus
3. Penicillium roqueforti
4. Penicillium camemberti
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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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Consider the given two statements:
| I: | Methane and power produced in anaerobic digestion facilities can be used to replace energy derived from fossil fuels, and hence reduce emissions of greenhouse gases. |
| II: | In developing countries, simple home and farm-based anaerobic digestion systems offer the potential for low-cost energy for cooking and lighting. |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.
Unlike human beings, in yeast the enzyme alcohol dehydrogenase:
| 1. | catalyzes the oxidation of ethanol to acetaldehyde |
| 2. | oxidizes methanol to produce formaldehyde and ethylene glycol |
| 3. | reduces acetaldehyde to ethanol |
| 4. | oxidizes nicotinamide adenine dinucleotide (NAD+) to NADH |
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