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SAI INTERNATIONAL SCHOOL


                                                         CLASS -IV


                                             SCIENCE-HOME ASSIGNMENT

                                                 Chapter 13- Our Environment


                                                    Sub Topic- Water Pollution


               A. Fill in the blanks.

               1. The factories release __________ wastes into the water bodies.

               2. In polluted water, aquatic plants and animals die due to
                   ___________ of oxygen.

               3. Farmers use _________substances to grow plants that get washed

                   into the rivers.

               4. The activities of people living near rivers, release ___________

                   substances into water.





               B. Answer the following.
                1.  What do you mean by water pollution? Write five causes of water
                    pollution.

                2.  Write five harmful effects of water pollution.
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