| Biodegradable resources | Non-biodegradable resources |
| $1.$ The substances which get degraded into their simpler and harmless forms over a period of time by biological processes are known as biodegradable. | $1.$ The substances which do not get degraded into their simpler and harmless forms over a period of time by biological processes are known as non-biodegradable. |
| $2.$ They are generally not harmful to the environment; e.g.,cow dung,leaves,paper,etc. | $2.$ They are often harmful to plants and animals as they accumulate in the environment; e.g.,$DDT$,plastic,polyethylene,etc. |
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