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SAI INTERNATIONAL SCHOOL
                                                      CLASS-VII

                                            SUBJECT - CHEMISTRY
                                TOPIC- MANAGEMENT OF WASTE WATER
                                      SUB TOPIC- CONCEPT MAPPING

                                               HOME ASSIGNMENT




                          Concept- Waste, Water Pollution


               Q1.  Define waste.                                                                    1

               Q2     Name two vectors which spread diseases.                                        1

               Q3     What are pollutants?                                                           1


               Q4                                                                                    1
                      This is an example of liquid waste
                          a)  Urine
                          b)  Smoke
                          c)  Broken glass
                          a)  Vegetable peels


               Q5     Eutrophication leads to                                                        1
                          a)  oxygen depletion in lakes
                          b)  chocked in drainage system
                          c)  Spread malaria.
                          d)  Do not cause any harm.

                                                   Concept- Sewage System, Constituents of sewage

               Q1.                                                                                   1
                      Name two inorganic constituents of sewage.

               Q2     What is man hole?                                                              1

               Q3     Name two diseases caused by bacteria.                                          1

               Q4                                                                                    1
                      Fill in the blank:-Two major nutrients present in sewage are …….   and
                      ………
               Q5     Full form of PVC is                                                            1

                          a)  Polyvinylchloride
                          b)  Polyvinyl carbon
                          c)  Pesticides vs. chemical
                          d)  Phosphorous value chloride





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