question_answer 12)

      Non-biodegradable pollutants are created by (a) nature                                                                            (b) excessive use of resources (c) humans                                                                         (d) natural disasters

Answer:

                      (c) Non-biodegradable pollutants have a slow or zero rate of degradation by general biological processes. They include plastics, tin container, heavy metals, radioactive substances, etc. These are created by human activities, like industrialization. Biodegradable pollutant are degraded or disposed quickly by biological processes. Some biodegradable pollutant created by human are paper, house hold waste like peel of vegetables, fruits and sewage.