pls answer these questions
4. How does domestic sewage affect the aquatic animals?
5. How does agricultural waste affect the aquatic animals, humans and plants?
6. What is meant by potable water?
7. Suggest any four parameters that could be followed before water is supplied for drinking
purposes.
8. Write any two purposes of purifying drinking water.
9. Name any two diseases that may result due to the consumption of contaminated water.
Answers
Answer:
Ans.4Nutrient pollution due to untreated sewage and fertilizers in runoff often leads to algal blooms in fresh and salt water. Small algal blooms provide food for fish and other aquatic organisms. Large algal blooms, however, deplete the dissolved oxygen in the water, leading to dead zones in aquatic systems.
Ans.5The algae cultivation in waste water is good option to recycle the carbon dioxide a potent green house gas; moreover, algal biomass can be converted into many value-added products like bio-oil. The dead animals and birds can be successfully composted to make nutrient-rich
Ans.6 Potable water is defined as water that is suitable for human consumption (i.e., water that can be used for drinking or cooking). ... Drinking water standards in the USA are developed by the US Environmental Protection Agency (EPA) as directed by the Safe Drinking Act of 1974.
Ans.7 1. It must be colourless or tasteless.
2. It must be free from suspended impurities.
3.it should not harmful for body.
4.Water should be free from microorganisms
Ans. 8 One major purpose of water purification is to provide clean drinking water. Water purification also meets the needs of medical, pharmacological, chemical, and industrial applications for clean and potable water
Ans.9 dangerous diseases like cholera and typhoid fever. Other waterborne diseases include diarrhoea, dysentery, polio and meningitis. Unclean water for washing can cause skin and infectious eye disease such as Trachoma
Explanation:
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