question_answer 37)

  Disposable plastic plates should not be used because (a) they are made of materials with light weight                (b) they are made of toxic materials (c) they are made of biodegradable materials     (d) they are made of non-biodegradable materials

Answer:

                  (d) Disposable plastic plates should not be used because they are made of non-biodegradable materials like plastics etc. The non-biodegradable materials cannot be broken down into harmless substances in nature, so they are major pollutant of the environment.