1) (a) A special TYPE of plastic used as fire-proof plastic. Answer : Melamine plastic.(b) A plastic used for making electrical switches and handles of VARIOUS utensils. Answer : Bakelite plastic.(c)A plastic which is used for making floor tiles, kitchenware and FABRICS which resist Answer : Melamine plastic ( ALSO used as making floor tiles ).(d) A plastic which is used for non-stick coating on cook wares Answer : PTFE plastic. (Polytetrafluoroethylene) ________________________________Answer 2) Disposal of plastic is a major problem because it results into land pollution, air pollution by burning and water pollution by disposing in water. This causes an unfriendly BEHAVIOUR with environment. Therefore disposing plastic is a major problem. But, to reduce it we can follow some ways:-Avoid plastic bags. Use cloth bag or any other bag except plastic while going out.Do not use plastic bottles, lunchbox and plastic straws.Avoid plastic packaging over food as it can cause cancer.________________________________Answer 3) As a responsible citizen what measures can I prefer to keep public places clean are:-Avoid plastic materials.Should throw rubbish in dustbins.Don't litter on roads etc.While you are out from your house, try to use public washrooms.Daily cleaning of public streets and roads to ensure that there is no garbage left.Spread awareness between people regarding cleanliness.________________________________Answer 4) a. Paper :- Biodegradable.b. Aluminium :- Non - biodegradable.c. Plastic bags :- Non - biodegradable.d. Cotton clothes :- Biodegradable.