Question sciencs. What are the different ways in which water gets contaminated? Answer: Following are the ways by which water gets contaminated:. Read More About the essay on pollution.
Question rextbook. At an individual level, how can you help to reduce air pollution? Answer: I can do the following things to reduce air pollution:. 8 class cbse science textbook uk 3. Clear, transparent water is always fit for hk. Answer: No, this is not true that clean, transparent Cbse Class 8 Science Textbook Solutions Pdf water is always fit for drinking. It is possible that they may carry disease-causing microorganisms. Thus, it is good to purify 8 class cbse science textbook uk before drinking.
Question 4. You are a member of the ecience body of your town. Svience a list of measures that would help your town to ensure the supply of clean water to all its residents. Answer: These are the measures that would help our town to ensure the supply of clean water to all its residents:. Question 5. Explain the differences between pure air and polluted air.
Other gases such as argon, methane, neon, water vapour. When this air is contaminated by unwanted tetbook which have harmful effect on both living and non-living things 8 class cbse science textbook uk nitrogen oxide, sulphur oxide, carbon monoxide. Question 6. Explain 8 class cbse science textbook uk leading to acid rain.
How does acid rain affect us? Answer: Nitrogen dioxide, sulphur dioxides are the pollutants which 8 Class Cbse Science Textbook Writing react with the water vapour present in atmosphere to form sulphuric acid and nitric acid. These acids come down with the rain, making the rain acidic. This is called acid rain.
Following are the affects of acid rain:. Question 7. Which of the following is not a greenhouse gas? Question 8. Greenhouse gases present in the atmosphere trap these radiations and claas not allow heat to leave.
This helps 8 class cbse science textbook uk keeping our planet warm and thus helps in survival. CO2, methane and CO are the gases responsible for this effect. Question 9. Prepare a brief speech on global warming. You have to deliver the speech in your class. Answer: Good Morning, Respected teacher and my dear friends, As we all know the continuous increase in the temperature of earth is called global warming.
Global warming is basically caused by pollution of air, excessive heat which is trapped by the greenhouse gases. Global warming 8 class cbse science textbook uk a threat to life 8 Class Cbse Science Textbook 5 Pdf as it causes a lot of health problems.
Xbse may have to face dire consequences due to global warming. Thank you for 88 attention. Have a good day. Question Describe the threat to the beauty of the Taj Mahal. Answer: Taj Mahal has become a matter of concern due to pollutants in air that are discolouring its white marble. Acid rains due to increasing air pollution has started corroding the marble. Suspended particulate matter, such as the soot particles emitted by Mathura oil refinery, has contributed towards the yellowing of the marble.
Thus dbse Taj Mahal losing its beauty. Why does the increased level of nutrients in the water affect the survival of aquatic organisms? Answer: Increased level textbooo nutrients in the water affect the survival of aquatic organisms as these act as nutrients for algae to flourish and once these algae die, they serve as food for decomposers like bacteria and a huge amount of oxygen in water body gets used up.
This results in decrease in the oxygen level, which may kill aquatic organisms. On the basis of your experience, compare the quality of air at the places given below: A park and a busy road. A residential area and an industrial area. A busy traffic intersection at different times sceince the day, e. A village and a town.
Solution: When we visit a park we find cbsf full of fresh air and in a busy road we find it polluted due to fumes, smoke, dust and sound. An industrial area is more polluted as compared to residential area as industrial area gets polluted with chemical pollutants, toxic gases. In early morning there is iess pollution but in afternoon it becomes a little more polluted than morning and in the evening it becomes extremely polluted.
A town is more polluted than a village. Conduct a survey of households in your neighbourhood and among friends to find out how many children are suffering from respiratory problems. Solution: Do it. You may even add more data to the following Table. Sckence 4 NCERT Textbook, Page You have various options of commuting 8 class cbse science textbook uk your school such as walking, going by bicycle, travelling by bus or other public transport, using a car individually, travelling by carpool.
Discuss in your class the impact of each of these options c,ass the quality of air. Pour each into separate glass containers. Compare these for smell, acidity and colour. Complete the following Table.
Do you remember how the sewage was cbze from your home and where scirnce went 8 class cbse science textbook uk Solution: The underground network of small and big pipes called sewers carries the sewage from the point of production to the point of disposal, i. Take a plastic bottle and cut it into 2 halves at the centre. Use the upper half as a funnel by putting it upside down in cbss lower half. Make layers in it with paper napkin or a fine cloth followed by, cotton, sand and then gravel.
Now zcience dirty water through the 8 class cbse science textbook uk and observe the filtered water.
Discuss the following questions amongst yourselves and with your teacher: Why do we need to filter water before drinking?
Where do you get your drinking water from? What will happen if we drink polluted water? Solution: Water which is full of dust particles and impurities is unfit for human health thus we need to filter water before drinking it. We get drinking water fbse government supply water scince hand pump.
Polluted water have disease-carrying microorganisms and dissolved impurities which can textbopk us seriously ill. Col-lect data on the sources of drinking water and the methods of sewage disposal. What are the common water-borne diseases in the community?
Which are the governmental and non-governmental organisations working in this field? What are the measures being taken by them for generating awareness? Write two causes of soil pollution. What is the full form of CFC? Answer: CFC � Chloro fluoro carbons. What is meant by air pollution? Answer: The presence of unwanted substances in the air which have a harmful effect on living and non-living components is known as air pollution.
What name is given to unwanted textboo present in the air? Answer: Air pollutants. Name the pollutants which are added from natural sources. Answer: Smoke and dust from forest fires or volcanic eruptions. Name the pollutants added by vehicles. Answer: Carbon monoxide, carbon dioxide, nitrogen oxides and smoke. What are the harmful effects of smog? Answer: Smog Causes breathing diseases such as 8 Class Cbse Science Textbook Journal asthma, cough and wheezing in children.
Which gases are released from petroleum refineries? Answer: Sulphur dioxide and nitrogen dioxide. How are CFCs added in the atmosphere?
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