A. World forest day
B. World environment day
C. World red cross day
D. World food day
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Effect of pollution is first marked on:
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Loss of forests, urbanization, increasing pollution are all due to:
A. Micro-organisms
B. Green vegetation of an area
C. Food crop
D. None of these
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Biological Oxygen Demand (BOD) is a measure of:
A. Population explosion
B. Nitrogen di-oxide
C. Global warming
D. Sulphur dioxide
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Escherichia coli is used as an indicator organism to determine pollution of water with:
A. Industrial wastes poured into water bodies
B. Extent to which water is polluted with organic compounds
C. Amount of carbon monoxide inseparably combined with haemoglobin
D. Amount of oxygen needed by green plants during night
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Besides dung, the weed that can be used in biogas production is:
A. Heavy metals
B. Faecal matter
C. Industrial effluents
D. Pollen of aquatic plants
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