Waste materials can be classified on the basis of whether they can be degraded, or broken down, by biological processes. Materials that get broken down by living organisms are called biodegradable materials. These are substances of plant or animal origin such as paper, wood, cotton, food materials and sewage. So, bio-degradable wastes can be broken down into simpler, natural substances by decomposes (saprophytes) such as bacteria and fungi. These substances are harmless and nontoxic.
Materials that cannot be broken down by living organisms are called non-biodegradable materials. Metals, plastics, DDT, detergents, certain dyes, etc., are some examples of non-biodegradable substances. Non-biodegradable materials are major pollutants. They may be chemically less active. So they remain unchanged in the environment for a long time. You have already seen how harmful materials like DDT and mercury can be Plastic bags, bottles, etc., often find their way to drains, etc. Since they do not decompose, they keep on adding up and finally, they choke the drains. Non-biodegradable detergents, dyes, etc., get into the soil and water bodies and harm the organisms living there.
In general, we should try to use biodegradable materials wherever possible to reduce the harmful effects of non-biodegradable materials. For certain things, we have a choice between biodegradable and non-biodegradable materials.
When some things in garbage rots completely and did not smell, it _______________ | |||
Right Option : C | |||
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Which of the following are correct ? (a) The bio-degradable wastes can be broken down into simpler, natural substances by decomposers such as bacteria and fungi. (b) Materials that cannot be broken down by living organisms are called non-biodegradable materials. (c) The biodegradable plastic is not a good choice, we have to choose between clay and paper. | |||
Right Option : A | |||
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Among the most dangerous non-biodegradable waste is ______________________ | |||
Right Option : D | |||
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