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 to the land to recover

Subtopic:  Resource Utilisation & Maintenance |
 78%
From NCERT
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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 green house gases
4. prevent hazards from radioactive nuclear wastes

Subtopic:  Ozone Layer Depletion |
 89%
From NCERT
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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 vapors

Subtopic:  Ozone Layer Depletion |
 73%
From NCERT
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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

Subtopic:  Green House Effect & Global Warming |
From NCERT
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The Three Mile island is famous as:
1. it hosted the Kyoto protocol
2. it was the site of a large oil spil
3. it was a site of nuclear accident
4. it hosted the Earth summit

Subtopic:  Agrochemical & Radioactive Waste |
 80%
From NCERT
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Burying the radioactive wastes is not acceptable to many people as:
1. there is a risk of groundwater contamination
2. it may explode
3. it will harm the buried dead bodies
4. it may get accumulated in vegetations

Subtopic:  Agrochemical & Radioactive Waste |
 68%
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The "Polyblend" developed by Ahmad Khan is a:

1. possible solution to accumulating plastic wastes
2. method for dealing with electronic wastes
3. synthetic fiber produced in India
4. organic farming product

 

Subtopic:  Solid Waste Pollution |
 92%
From NCERT
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Ecological sanitation, also known as ecosan, is a new paradigm in sanitation that
1. eliminates the use of conventional pesticides to decrease environmental insult
2. recognizes human excreta and household waste water as resources that can and are recovered, treated, and reused
3. emphasizes the disposal of solid wastes in sanitary landfill sites
4. emphasizes the need for strict legislation against polluting industries

Subtopic:  Water Pollution: II | Water Pollution |
 80%
From NCERT
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High concentrations of accumulated DDT in birds
1. kills pathogens in their blood
2. causes sterility by affecting gametogenesis
3. leads to premature breaking of eggs
4. causes spasticity of the muscles ofthe body

Subtopic:  Water Pollution: I | Water Pollution |
 93%
From NCERT
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What was added in 1987 as a pollutant to The Air (Prevention and Control of Pollution) Act, [originally passed in 1981] :
1. radioactive wastes
2. CFCs
3. ground level ozone
4. noise

 

Subtopic:  Air Pollution |
 86%
From NCERT
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