Q. No.Slash and burn agriculture leads to nutrient-depleted soils and deforestation if:
1. crash crops are implanted rather than cereals
2. it is practiced in a sufficiently larger area
3. some useful trees are retained by the farmers
4. sufficient time is not allowed for the land to recover
1. crash crops are implanted rather than cereals
2. it is practiced in a sufficiently larger area
3. some useful trees are retained by the farmers
4. sufficient time is not allowed for the land to recover
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According to the recommendations of the National Forest Policy of 1988, what percentage of the area is recommended as forest cover for hills?
| 1. | 19 | 2. | 33 |
| 3. | 50 | 4. | 67 |
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The Montreal Protocol was signed in 1987 to:
| 1. | prevent deforestation around the world |
| 2. | control the emission of ozone-depleting substances |
| 3. | control the greenhouse gases |
| 4. | prevent hazards from radioactive nuclear wastes |
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What is bad ozone?
1. Ozone formed in the troposphere
2. Ozone found in the lower stratosphere
3. Ozone found in the upper stratosphere
4. Ozone formed in the lab
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UV rays are highly injurious to living organisms as:
1. they are part of invisible electromagnetic spectrum
2. they cannot be stopped by atmospheric gases
3. they are preferentially absorbed by DNA and proteins
4. they cause dissociation of atmospheric oxygen
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The thickness of ozone layer is measured in :
1. Centimorgan (cM)
2. Dobson unit
3. Roentgens
4. Lux
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CFC have a continuing effect on ozone layer as:
| 1. | the Cl atoms formed by them only act as catalysts in reactions causing degradation of ozone |
| 2. | the Cl atoms formed by them are used up in reactions causing degradation of ozone |
| 3. | they are being produced in increasing amounts all over the world |
| 4. | they are efficiently absorbed by the atmospheric water vapours |
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Ozone hole is:
| 1. | a partial gap in the stratospheric ozone layer over Antarctica |
| 2. | a partial gap in the stratospheric ozone layer over Arctic |
| 3. | thinning of ozone layers over polar regions |
| 4. | excessive buildup of lower troposphere ozone |
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Which of the following is implicated in the causation of skin cancers and snow-blindness cataracts in humans?
| 1. | UV – A | 2. | UV - B |
| 3. | UV - C | 4. | None of the above |
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The normal greenhouse effect is necessary for survival of life on Earth as it has raised the temperature of Earth’s surface by:
| 1. | - 18°C | 2. | 15°C |
| 3. | 33°C | 4. | 50°C |
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