Environmental Issues

Biology
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A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called as

A
Ley farming
B
Contour farming
C
Strip farming
D
Shifting agriculture
Hard
NEET
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Global warming can be controlled by

A
Reducing deforestation, cutting down use of fossil fuel
B
Reducing reforestation, increasing the use of fossil fuel
C
Increasing deforestation, slowing down the growth of human population
D
Increasing deforestation, reducing efficiency of energy usage
Hard
NEET
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When domestic sewage mixes with river water 

A
The river water is still suitable for drinking as impurities are only about 0.1%.
B
Small animals like rats will die after drinking river water.
C
The increased microbial activity releases micronutrients such as iron.
D
The increased microbial activity uses up dissolved oxygen.
Hard
NEET
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Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

A
Petroleum industry
B
Sugar industry
C
Domestic sewage
D
Dairy industry
Hard
NEET
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High value of BOD (Biochemical Oxygen Demand) indicates 

A
Water is less polluted
B
Consumption of organic matter in the water is higher by the microbes
C
Water is pure
D
None of these
Hard
NEET
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World ozone day is celebrated on __________

A
September
B
June
C
April
D
April
Medium
NEET
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