dirty streets air pollution light up the sky make the atmosphere polluted injuries while bursting them Which of the two has more points? Think-should we burst crackers or say no to crackers? Reference To Context Dada od Read the following statement and answer the questions that follow. He saw Mummy put some money into Chinamma's hands and suddenly, he had an idea (a) Why did Mummy put some money into Chinamma's hands? (b) Who was 'He' and what was the idea that 'He' got? (c) Do you think it was a good idea? (d) What happens next? TS Questions Order Thinking Skills Questions "In the whole of Delhi, there isn't a colony that glows brighter this Diwali, than this one." Do think the magician was justified in saying this? Support your answer with reason/reasons. Do you think the title of the story 'A Different Diwali' is appropriate? Give reasons.
Answers
Explanation:
Q.1. What are the different ways in which water gets contaminated? Water gets contaminated by the following ways: (i) Many industries discharge harmful chemicals to rivers and streams. (ii) Water gets contaminated when sewage is disposed off in rivers. (iii) Pesticides, weedecides and other chemicals also dissolve in water and get contaminated. (iv) Breeding of microorganisms makes water polluted.
Q.2. At an individual level, how can you help reduce air pollution?Ans. By this process we reduce air pollution: (i) We can plant trees to reduce the level of carbon dioxide and air pollution. (ii) By using CNG and unleaded petrol in our vehicle. (iii) By using public transport as far as possible. (iv) By giving general awareness about air pollution to our family and friends.
Q.3. Clear, transparent water is always fit for drinking. Comment.Ans. Clear, transparent water is always fit for drinking. This is not true, because many microorganisms ace present in it. So we clean it by boiling.
Q.4. 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.Ans. A list of measures that would help our town to ensure the supply of clean water to all its residents (i) Proper cleaning of water tank. (ii) Chlorine tablets should be made available. (iii) To get clean water in every household, it is necessary that water reaching the houses should be treated.
Q.5. Explain the differences between pure air and polluted air.Ans. Pure air is free from germs and harmful gases. It contains 78% nitrogen, 21% oxygen and small amount of other gases and dust particles. Polluted air contains harmful gases and unwanted substances.
Q.6. Explain circumstances leading to acid rain. How does acid rain affect us?Ans. Some pollutants like sulphur dioxide and nitrogen dioxide react with the water vapour present in the atmosphere to form sulphuric acid and nitric acid. The acid drops down with rain, making the rain acidic. This is called acid rain. Acid rain affects us in many ways. (i) Acid rain corrodes the marble of the monument. (ii) Acid rain damages building and sculptural materials. (iii) Acid rain damages fresh water also. (iv) Acid rain also damages our crops and also makes it poisonous. (v) Acid rain damages the leaves of plants.
Q.7. Which of the following is not a greenhouse gas? (a) Carbon dioxide(b) Sulphur dioxide (c) Methane(d) Nitrogen.Ans. Nitrogen.
Q.8. Describe the `Greenhouse Effect' in your words:Ans. Greenhouse Effect means warming the Environment. When the sun rays reach on earth, a part of the radiation that falls on the earth is absorbed by it and a part is reflected back into space. A part of the reflected radiation is trapped by the atmosphere. This trapped radiation further warms the earth. This is called Carbon House effect. CO2 is one of the gases responsible for this effect.
Q.9. Prepare a brief speech on global warming. You have to deliver the speech in your class.Ans. Continuous increase in temperature of the earth is called global warming. There are many reasons for it. One of them is increase in population. Increase in the number of vehicles is also one of the causes. Pollution of air has also increased the global warming. Cutting trees, grazing the plants by animals increase the global warming.
Q.10.