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प्रश्न
Excess of fluoride in drinking water causes:
विकल्प
Lung disease
Intestinal infection
Fluorosis
None of the above
उत्तर
Fluorosis
संबंधित प्रश्न
What do you mean by Biochemical Oxygen Demand (BOD)?
A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.
An example of non-biodegradable waste is
A. Vegetable peels
B. Sewage
C. Livestock waste
D. DDT
Study the picture given below and answer the following questions :
Mention the impact of this pollution on human health.
Explain the following :
(i) Eutrophication ;
(ii) Biomagnification
Answer the following question:
Name two human diseases caused due to water pollution.
State whether the following statement is true or false. If false, write the correct statement.
Chemical pollutants include a metallic salt solution of mercury and lead.
Name the following
An agricultural pollutant in water
List the cause of water pollution.
What are some types of pollutants found in water?
With reference to the sources of water pollutants answer the following question:
In what way does the industrial waste pollute water?
Usage of chemical pesticides and fertilisers causes ________ pollution.
Explain the different ways by which water gets polluted.
Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water?
What are the major sources of Water pollution?
Read the paragraph and answer the questions following it.
Water is essential for life. Without water there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g. municipal and industrial discharge pipes, where pollutants enter the water source. Non-point sources of pollution are those where a source of pollution cannot be easily identified, e.g. agricultural run-off, acid rain, etc.
- How do you classify the various sources of water pollution?
- What are the point sources of water pollution?
- Name any two non-point sources of water pollution?
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of ______.
A river with an inflow of domestic sewage rich in organic waste may result in:
Water sample is called cleanest on the basis of which one of the BOD values is given below.
Hot water discharged into water bodies hardly affects the fish and other aquatic life.
