Question

C LONG-ANSWER TYPE QUESTIONS : Answer in 20-25 words
1.How are the pollutants classified ? Give one example of each type.
Give proper answer class 8​

Answer 1

Answer:

Any substance present in the environment in harmful concentration, which ad­versely alters the environment by damaging the growth rate of a species and by interfering with the food chains, is toxic and affects the health, comfort and property etc. is considered as a  From the ecosystem point of view, i.e., according to their natural disposal, pollutants are of two types:

(a) Bio-degradable Pollutants:

These are the pollutants that are quickly degraded by natural means. Heat or thermal pollution, and domestic sewage are considered in this category as these can be rapidly decomposed by natural processes or by engineered systems such as municipal treatment, plants etc.

(b) Non-degradable Pollutants:

These are the substances that either do not degrade or degrade very slowly in the natural environment. These include mercury salts, long chain phenolic chemicals, DDT and Aluminum cans etc.

Such non-degradable pollutants accumulate and are biologically magnified as they move in the biogeochemical cycle and along food chains in the ecosystem. For example, DDT, when washed from the ground goes to the streams where it is absorbed by the phytoplankton’s which are eaten by the fishes.

So, the initial dose of DDT which was harmless in the phytoplankton becomes very harmful as it accumulates in the fish day by day, with the result that large populations offish die or become sterile and same is the case with the birds feeding on such fishes. This phenomenon is known as bio-magnification or biological magnification pollutant.

Explanation:

Answer 2

Answer:

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Explanation:

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