Tag: effect of water pollution
Questions Related to effect of water pollution
BOD is ___________ in polluted water and ________in potable water.
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more, less
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less, more
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less in both
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medium in both
BOD of wastewater is amount of
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total organic matter
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biodegradable organic matter
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oxygen evolution
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oxygen consumption
biological oxygen demand is the amount of Oxygen required by aerobic micro-organisms for the breakdown of organic matter present in waste water or polluted water.
Measurement of the rate of oxygen consumption in unit volume of water over a period of time is done to find out
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Biogas generation
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Biological oxygen demand
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Biosynthetic pathways
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Fermentation
Decomposition of organic matter by microbes requires oxygen. Degree of impurity of water due to organic matter is measured in terms of 'Biological Oxygen Demand (BOD)'. BOD is the oxygen in milligrams required for 5 days in 1 litre of water at 20 degree centigrades for the microorganisms to metabolise organic wastes.
Biological Oxygen Demand (BOD) is a measure of
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Industrial wastes poured into water bodies.
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Extent to which water is polluted with organic compounds.
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Amount of carbon monoxide inseparably combined with haemoglobin.
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Amount of oxygen needed by green plants during night.
Decomposition of organic matter by microbes requires oxygen. Degree of impurity of water due to organic matter is measured in terms of Biochemical oxygen demand or (BOD). BOD is the oxygen required by microorganisms to completely metabolise organic wastes present in water.
Huge quantity of sewage is dumped in a river. The BOD will.
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Increase
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Decrease
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Slightly decrease
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Remain unchanged
A huge quantity of sewage increases Organic matter in the river water.
Biochemical oxygen demand measures
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Industrial pollution
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Air pollution
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Dissolved oxygen required for decomposers
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Pollution capacity of effluents
Multiple Choice Questions
Biochemical oxygen demand may not be good index for water bodies receiving effluents from.
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Sugar industry
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Domestic sewage
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Dairy industry
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Petroleum industry
Biochemical Oxygen Demand or BOD is the amount of dissolved oxygen in a water body, required by microorganisms for the aerobic breakdown of organic matter in the water. Petroleum waste consists of inorganic constituents that also may cut off the oxygen supply into the water body thus BOD may not be a good index for water receiving effluents containing it.
If a water body have high amount of DDT it's 'Biochemical Oxygen Demand' (B.O.D.) will
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Decrease
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Not affected
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Increase
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First decrease than increase
Biological Oxygen Demand (BOD) is one of the most common measures of pollutant organic material in water. BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. When BOD levels are high, dissolved oxygen (DO) levels decrease because the oxygen that is available in the water is being consumed by the bacteria. Since less dissolved oxygen is available in the water, fish and other aquatic organisms may not survive.
The enhanced growth of water hyacinth in lakes can be due to
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Disposal of solid wastes in water bodies
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Availability of more nutrients to the flora of a water ecosystem
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Discharge of sewage into water bodies
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All of the above
Water hyacinth (Eichhornia crassipes) also known as Bengal terror is waterweed often blamed for choking water bodies and creating problems for aquatic plants and animal due to less availability of oxygen. It mainly grows where organic nutrient is present in large amount. Level of the nutrient increase due to use of pesticide, weedicides, of discharge of sewage into the water bodies.
BOD of lake becomes high by :-
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Vehicles
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Wind mill
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Smoke and ammonia
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Detergents