take two pots of some soil and some pulses keep one pot outside and one pot inside your home where there is no sunlight. observe and make a note about each pot.
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Plant waste in pot A has been decomposed. The plant waste has been converted into manure by the action of microbes. The nutrients released in the process could be used by the plants again. So, they are called biodegradable.
In pot B, the polythene bags, empty glasses, bottles and broken toy parts did not undergo any such change. The microbes could not 'act' on them and convert them into manure. So, they are called non-biodegradable.....
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