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
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 |
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. |
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 |
A biological control being developed for use in the treatment of plant diseases is the fungus:
1. | Trichoderma | 2. | Pneumocystis |
3. | Claviceps | 4. | Epidermophyton |
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
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 |
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 |