What is plastic sulphur?Is it the plastic used in polythene bags?
Fill in the following blanks with suitable words :
(a) Synthetic fibres are also called .......... or ....... fibres.
(b) Synthetic fibres are made from raw materials called .......
(c) Like synthetic fibres, plastic is also a ........
(d) The use of plastics can be reduced by using bags made of ........ or ......... instead of polythene bags.
How do carelessly thrown plastic bags (polythene bags) affect :
(a) dirty water drains and sewers ?
(b) animals (such as cows) ?
What is the difference between polythene and plastic?