Choose the correct words to fill in the blanks.
Pollutant is defined as, a substance or an agent which causes pollution. (i) and (ii)_ are chemical pollutants. Pollutants can be (iii)_ which rapidly break down by (iv)_____ processes.

(i) Heavy metals (ii) DDT (iii) degradable (iv) natural

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(i) Particulates (ii) heavy metals (iii) non degradable (iv) artificial

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(i) Non degradable (ii) petroleum (iii) degradable (iv) artificial

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(i) Micro organism (ii) natural gas (iii) non degradable (iv) natural

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Solution

The correct option is A (i) Heavy metals (ii) DDT (iii) degradable (iv) natural
The pollutant is defined as an agent that causes an adverse effect on our environment. Examples of some chemical pollutants are Heavy metals, volatile organic compounds such as DDT.
Pollutants can be degradable which can be broken down by a natural process with the help of microorganisms.

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Similar questions

Column I	Column II
(a) Particulate matter	(i) Chemical water pollutants
(b) Oil spills	(ii) Non-degradable
(c) Detergents	(iii) Degradable soil pollutants
(d) Plastics	(iv) Air pollutants
(e) Domestic wastes	(v) Physical water pollutants

	Biodegradable pollutants	Non-biodegradable pollutants
(i)	These are the pollutants that can be easily degraded by micro-organisms.	These are the pollutants that can not be degraded into harmless materials.
(ii)	These can be used to produce energy (through biogas), compost, manure, etc.	These are difficult to manage as a natural method of degradation is absent.
(iii)	These usually do not enter biogeochemical cycles.	These become a part of rapid turnover in biogeochemical cycles.
(iv)	Examples: DDT, BHC, plastics, polyethylene, glass, etc.	Examples: Sewage, garbage, animal waste, etc.

	Column I		Column II
(A)	Biodegradable pollutants	(i)	DDT
(B)	Non-biodegradable pollutants	(ii)	$S O_{2}$
(C)	Primary pollutants	(iii)	PAN
(D)	Secondary pollutants	(iv)	Sewage

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