After the ban on plastic bags, students of one school decided to make the people aware of the harmful effects of plastic bags on environment ans Yamuna River. To make the awareness more implctful, they organized rally by joining hands with other school and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All students pledged not to use polythene bags in future to save Yamuna River.
After reading the above passage, answer the following questions :
(i) What values are shown by the students ?
(ii) What are biodegradable polymers ? Given one example.
(iii) Is polythene a condensation or an addition polymer ?

Explanation

(i) Students have discharged their responsibility towards the society by making the people aware of the harmful effects of the environmental pollution (soil ans water) on their general health and , flora and fona of the nature caused by used of plastic bags.
(ii) Biodegradable polymers decomposes by themselves over a period of time by microorganism producing harmless hydrolysis and oxidation products thereby saving the environment from getting polluted. These polymers have functional groups present in biopolymers and lipids. For example, dextron , i.e., poly (glycollic acid) poly (lactic acid) used for stitching of wounds after operation.
(iii) Polythene is an addition polymer formed by addition of a large number of ethene molecules. This polymerization occurs by free radical mechanism which is initiated by oxygen or peroxide.