а) These are broken down into simple and harmless substances by the action micro¬organisms.
(b) They do not cause environmental pollution.
Example : Paper, cotton cloth, peel of vegetables etc.
Non biodegradable substances:
(a) There is no effect of microorganisms on these substances and hence they cannot be broken down into simpler substances.
(b) They cause environmental pollution. Example: Plastics, glass, DDT etc.