Q. No.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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‘Toddy’, a traditional drink of some parts in southern India, is made by fermenting sap from:
| 1. | Soyabean | 2. | Bamboo shoots |
| 3. | Palms | 4. | Sugarcane |
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With reference to human beings, antibiotics are actually:
| 1. | Anti life | 2. | Pro-life |
| 3. | Irrelevant to life | 4. | Defining life |
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Which of the following human diseases cannot be treated by antibiotics?
| 1. | Plague | 2. | Diphtheria |
| 3. | Leprosy | 4. | Mumps |
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“Clearing” of fruit juices in industrial preparations is achieved by the action of enzyme:
| 1. | Papain | 2. | Lysozyme |
| 3. | Pectinase | 4. | Lipase |
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The figure shows two parameters that can be used as a measure of pollution levels in sewage water. The red and blue color shows the change in the levels of these parameters during sewage water treatment. A and B respectively can be:
| 1. | BOD and COD | 2. | BOD and DO |
| 3. | DO and BOD | 4. | Organic matter and BOD |
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In the secondary treatment or biological treatment of sewage water, the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and the air is pumped into it. This allows:
1. vigorous growth of useful aerobic microbes into flocs
2. the decrease in the number of aerobes in the water
3. rapid increase in the count of methanogens
4. a dramatic decrease in the anaerobic methanogens
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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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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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