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14.11. What are the major causes of water pollution? Explain.
Answers (2)
The major cause of water pollutions are -
- Radioactive waste- These waste substances are direct throw into the oceans.
- Pathogens- include bacteria and other organisms, which enters into the water from animal excreta and domestic sewage. Also, human excreta contain bacterias like Escherichia coli and Streptococcus faecalis which cause gastrointestinal diseases
- Organic Wastes- These are biodegradable waste that pollutes water as a consequence of runoff. The excess of organic matter in water causes a decrease in the amount of oxygen held by the water.
- Chemical pollutants- water-soluble inorganic chemicals such as heavy metals like cadmium, mercury, nickel etc. The presence of these metals in the human body, damages the kidneys, central nervous system, liver etc. These are dangerous for human beings because our body cannot excrete them.
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