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प्रश्न
Why are open drains a concern?
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उत्तर
Drains that are not covered may get blocked with solid wastes like plastic bags, rags and gravel. Such drains are flooded with dirty water that stagnates and is polluted emitting foul smells and provides breeding grounds to various microbes. Mosquitoes lay eggs and breed causing the spread of diseases like malaria and dengue. Sewage wastes also carry germs that cause serious waterborne diseases like cholera, typhoid, dysentery and jaundice.
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संबंधित प्रश्न
What is done to make drinking water clean and safe?
Use your brain power!
How should roads and footpaths be built to make rainwater seep into the ground?
What works are undertaken to make water available even after the rainy season?
Which of the following procedures will give you water free from all impurities?
Fill in the blanks with the help of words given in bracket after the sentence.
Water which looks clean still has disease carrying ______ and ______ impurities.
(insects, microorganisms, particles, dissolved, harmful)
Which of the following is a part of inorganic impurities of the sewage?
The process of adding chlorine in adequate amounts to water is called ______.
______ from the air and sunlight destroy the germs present in water.
Temporary and permanent hardness can be removed by the method of boiling.
Name the chemical which converts chlorides and sulphates into insoluble carbonates.
