हिंदी

What Are the Different Ways in Which Water Gets Contaminated? - Science

Advertisements
Advertisements

प्रश्न

What are the different ways in which water gets contaminated?

Advertisements

उत्तर

Water gets contaminated by the addition of:

Agricultural chemicals: Farmers use excessive amounts of pesticides and fertilizers to increase crop production. These chemicals get carried away to the water bodies due to rains and floods which lead to water pollution.

Industrial wastes: Industries release harmful chemical wastes into water sources, thereby polluting them

Sewage wastes: Waste materials from kitchens, toilets, and laundry sources are also responsible for contaminating water.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 18: Pollution of Air and Water - Exercises [पृष्ठ २५०]

APPEARS IN

एनसीईआरटी Science [English] Class 8
अध्याय 18 Pollution of Air and Water
Exercises | Q 1 | पृष्ठ २५०

संबंधित प्रश्न

Why does the increased level of nutrients in the water affect the survival of aquatic organisms?


Why is forest considered a natural ecosystem?


State whether the following statement is true or false :
Chipko Andolan was associated with the conservation of wild animals such as tigers and lions.


What is a natural resource? Name three important natural resources.


The Chipko Andolan is associated with :
(a) Tigers
(b) Turtles
(c) Trees
(d) Tomatoes


The three R's which can help us to conserve natural resources for long term use are ______


In a village, farmers started cultivating crops all around a lake which was always filled with water. They added lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of water in the lake was covered with a green layer made up of tiny organisms X. After some time, the fish present in the lake started dying in large numbers because they could not get sufficient Y due to a process Z which had occurred in lake water and drained out all the Y present in the water of lake.
(a) What do you think materials W are?
(b) Name (i) X, and (ii) Y.
(c) What is the process Z known as?
(d) What happens during the process Z which uses up all the Y present in lake water?
(e) What does this example tell us about the use of materials like W?


Where and how did "Chipko Andolan" start in our country? How did this movement ultimately benefit the local people? 

 

 


Which plan has been started by the government to control the pollution of Ganga? 


The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×