Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ________ your teeth, leaving the ________ running may waste several ________ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for _________ is called ________ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ________ and ________ impurities. (insects, microorganism, particles, dissolved, harmful).
(a) When air is contaminated by unwanted substances which have a harmful effect on both the living and non-living, it is referred to as air pollution.
(b) Many industries are responsible for causing air pollution. Petroleum refineries are a major source of gaseous pollutants like sulphur dioxide and nitrogen dioxide.
(c) While brushing your teeth, leaving the tap running may waste several liters of water.
(d) Water which is suitable for drinking, is called potable water.
(e) Water which looks clean still has disease-carrying microorganisms and dissolved impurities.
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- The components of air which are harmful to living beings are(a) nitrogen and carbon dioxide(b) dust and water vapour(c) dust and smoke(d) smoke and water vapour
- Name one source and one harmful effect of each of the following air pollutants:(a) Sulphur dioxide(b) Nitrogen oxides(c) Carbon monoxide(d) Chlorofluorocarbons (CFCs)
- (a) What is meant by water pollution? What are the different ways in which water gets polluted?(b) State the harmful effects of water pollution.
- Fill in the blanks in the following statements using words given in the box.[ air, handpumps, cholera, water, large, ground ]A very ______ number of our people defecate in the open. It may cause______ pollution and soil pollution. Both the surface water and ______ water get polluted______ water is the source for wells, tube wells and ______. Thus it becomes the most common route for ______ borne diseases like ______ , dysentery, etc.
- Potable water is the water which is(a) obtained from a river (b) obtained from a lake(c) pure and fit for drinking (d) used only for washing clothes
- Clouds are(a) tiny drops of water floating in air(b) mixture of dust and water vapour(c) particles of water vapour(d) rain drops in air.
- Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.
- A pond contains clean water. Which of the following activities will produce least pollution of water?(a) Washing clothes in the pond (b) Bathing animals in the pond(c) Washing motor vehicles in the pond (d) Swimming in the pond
- Fill in the Blanks:The air is a ______________ of gases, dust particles, and water vapour.
- State whether the following statement are True/False.(i) We can survive for sometime without air but we cannot survive even for a few minutes without food.(ii) A brick kiln emits lot of smoke and other harmful gases causing air pollution.(iii) Carbon monoxide is produced by complete burning of fuels such as coal, petrol, diesel.(iv) Chlorination is a commonly used chemical method for killing germs in water.(v) Water which is suitable for drinking is called soft water.
- Name any two water pollutants which are toxic for both plants and animals.
- When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of:(a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour
- Air and Tap Water are mixtures. Explain.
- Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon.(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
- (a) >What is air? Write the names of various constituents of air.(b) What is air pollution? What are the main sources of air pollution?
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