Mata Gujri Public School Unit-11 Class 4th Sub-English M-80 1. Read the following passage carefully and answer the questions that follow: (10) The burning of fuels and cutting of troes in large quantities has resulted in gradual increase in carbon dioxide in the air. If carbon dioxide goes on increasing, in next fifty years, rise in air temperature would melt polar ice- caps and sen level would rise, causing floods in coastal regions. Burning of coal and oil also adds sulphur dioxide gas to the atmosphere. This causes 0 irritation in the eyes and lungs. Air pollution affects plants and animals as well Water pollution takes place when wastes from factories are let into rivers. The most widespread source of water pollution is disposal of sewage Polluted water affects water animals and waret plants. Ocean waters are polluted by oil spills from tankers. The sewage from cities located along the coasts are dumped into the sea.