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What are biodegradable and non-biodegradable materials?
Biodegradable substances are those substances which can be decomposed by bacteria and other natural processes. For example leaf, wood, silk etc.
Those substances which cannot be decomposed are called non-biodegradable substances. Plastics are non-biodegradable. For example polythene, nylon, plastics, etc.
Give examples which indicate that nylon fibres are very strong.
Explain why plastic containers are favoured for storing food.
Explain the difference between the thermoplastic and thermosetting plastics.
Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Categorise the materials of the following products into ‘can be recycled’
and ‘cannot be recycled’:
Telephone instruments, plastic toys, cooker handles, carry bags, ball point
pens, plastic bowls, plastic covering on electrical wires, plastic chairs,
electrical switches.
Rana wants to buy shirts for summer. Should he buy cotton shirts or
shirts made from synthetic material? Advise Rana, giving your reason.
Give examples to show that plastics are noncorrosive in nature.
Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
‘Avoid plastics as far as possible’. Comment on this advice.
Match the following of column I correctly with the phrases given in column II:
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