• What are the different ways in which water gets contaminated
• At an individual level, how can you help to reduce air pollution
• Clear, transparent water is always fit for drinking. Comment.
• You are a member of the municipal body of your town. Make a list of measures that would help your town to ensure the supply of clean water to all its residents.
• Explain the differences between pure air and polluted air.
• Explain circumstances leading to acid rain. How does acid rain affect us
• Which of the following is not a greenhouse gas

         (a) carbon dioxide (b) sulphur dioxide (c) methane (d) nitrogen

• Describe the ‘greenhouse effect’ in your own words.
• Prepare a brief speech on global warming.
• Describe the threat to the beauty of the Taj Mahal.
• Why does the increased level of nutrients in the water affect the survival of aquatic organisms? 

Important questions

• The level of air pollution is higher at busy traffic intersections. Why
• What do CFCs stand for
• Name some devices where CFCs are used. Why CFCs are considered pollutants
• A gas X is present in the stratosphere that prevents ultraviolet radiations of the sun from reaching the earth. Name the gas.
• The combustion of fossil fuels generates a lot of air pollution. Name two alternative sources of energy that do not cause any pollution.
• Burning dry leaves causes air pollution. What should be done to dispose of the dry leaves
• Hot water can also be a pollutant. Explain how
• Name any two sources which cause air pollution due to Suspended Particulate Matter (SPM).
• What is the ozone layer What will happen if the ozone cover of the atmosphere is removed?
• Why we should plant trees and nurture the ones already present in the neighborhood
• Write a short note on the Ganga action plan. Also, list some reasons for pollution in the river Ganga.
• What is meant by chlorination?
• What are the traditional ways of purifying water to make it fit for drinking
• Name the types of water pollutants.
• Which are the various sources that pollute water
• Is smog an air pollutant
• The use of excessive fertilizers and pesticides leads to the deficiency of an important substance in water. Name the substance.
• Trees help in reducing pollution of our environment. A large number of trees are planted by the people in the month of July every year.
• This occasion is called
• It is said,” CO2 contributes to global warming.” Explain.
• Air is a mixture of various gases. One of the gas is 21% part of the air and is essential for the survival of human beings. This gas is called
• Which of the following is not a source of air pollution

         i)Automobile exhaust ii) Windmill iii) Burning of firewood iv)Powerplant

• Ramesh wishes to contribute to reducing air pollution. Which vehicle should he use for going to school

         a)Carb) Autorickshaw c) School Bus d) Scooter

• We can survive for some time without air but we cannot survive even for a few minutes without food Comment.
• Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel. Comment.
• The type of pollution which is likely to affect Taj Mahal in Agra

         a) Air pollution b) Water pollution c) soil pollution d) noise pollution