CBSE Class 8 - Science - Chapter 18 - Pollution of Air and Water (Worksheet)(#eduvictors)(#class8Science)

Pollution of Air and Water (Worksheet)

CBSE Class 8 - Science - Chapter 18

All organisms including plants, animals (including human beings) and micro-organisms live in a habitat and interact with the ecosystem. Both biotic and abiotic components constitute environment. A harmful change in environment due to pollution cause discomfort and affect the lives of living beings.

Fill in the blanks

1. Substances that cause harmful changes in the air, soil or water are called ___________.


2. Incomplete burning of fossil fuels, like petrol and diesel, results in the production of colourless, odourless and toxic gas called ______________.


3. ________ is a mix, in the air, of smoke and chemicals with fog.


4. CFCs contribute to the depletion of the ________ layer that protects us from the harmful ultraviolet rays of the sun.




5. Burning of fossil fuels releases toxic gases like carbon dioxide, sulphur dioxide, nitrogen oxides. Precipitation carries these toxic gases back to the earth as __________.


6. The corrosion of the Taj Mahal due to acid rain is called _____________.


7. _____________ has already started melting the polar ice caps, which has resulted in a rise in the global sea level.


8. Gases, like carbon dioxide, methane, nitrous oxide and water vapour, also contribute to the __________ effect,


9. ________ makes up 75 per cent of the human body.


10. Water pollution drastically reduces the quantity of dissolved _________ in water, which results in the death of aquatic organisms.


11. Water that is suitable for drinking is called _________ water.


12. Municipal bodies treat water before supplying it to our households. They use ____________ method to kill harmful microbes


Answers:
1: pollutants
2: carbon monoxide
3:  Smog
4: ozone
5: acid rain
6: 'marble cancer'
7: Global warming
8: greenhouse
9: Water
10: oxygen
11: potable
12: chlorination

☛See also:

Ch 18 - Pollution of Air and Water (NCERT Solutions)
Ch 18 - Pollution of Air and Water (Chapter Study Notes)