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प्रश्न
Excess of fluoride in drinking water causes:
विकल्प
Lung disease
Intestinal infection
Fluorosis
None of the above
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उत्तर
Fluorosis
संबंधित प्रश्न
Have you ever observed any water pollution in your area? What measures would you suggest to control it?
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.
Define pollution. “Industries are pouring poison in water” - Explain
Give an account of various sources and harmful effects of water pollution.
Differentiate between chemical pollution and thermal pollution.
Water in the sea is sweet.
Usage of chemical pesticides and fertilisers causes ________ 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?
Study the picture given below and answer the question:
How does water get polluted?
Define the following term:
Oil spills
