Disposable plastic plates should not be used because

Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

In the following groups of materials,which group$(s)$ contains only non-biodegradable items?
$(i)$ Wood,paper,leather
$(ii)$ Polythene,detergent,$PVC$
$(iii)$ Plastic,detergent,grass
$(iv)$ Plastic,bakelite,$DDT$

Differentiate between biodegradable and non-biodegradable substances with the help of one example each. List two changes in habit that people must adopt to dispose of non-biodegradable waste,for saving the environment.

Distinguish between biodegradable and non-biodegradable substances. List two effects of each of them on our environment.

Name two gases which have replaced $CFCs$.