Single Matching. Match the articles of column I and column II Column I Column II (a) Carbon dioxide (i) Bacteria (b) Nitrogen fixation (ii) ODS (Ozone depletion substances ) (c) CFCs (Chlorofluorocarbons) (iii) GHG (Greenhouse gas) (d) Decomposers (iv) Fossil fuel (e) Oxides of nitrogen and sulphur (v) Mineralization

a-iii Carbon dioxide is a three atoms gas molecule. They capture Earth's outgoing infrared energy, which increases the temperature on the surface of the earth and cause global warming and this in turn results in the release of greenhouse gases. b-i By turning atmospheric nitrogen N 2 into ammonia NH 3 , soil bacteria perform nitrogen fixation. Plants use this ammonia to synthesise proteins. c-ii Chlorofluorocarbons are chlorine-containing compounds. When combined with bromine in the atmosphere, one chlorine atom destroys 100,000 ozone molecules. Therefore, ozone-depleting substances are chlorinating compounds. d-v Soil microorganisms (Decomposers) such as bacteria, fungi, etc., convert organic substances into inorganic substances by the process of mineralisation. e-iv When burned, fossil fuels release nitrogen oxides into the environment. Many fossil fuels also contain sulphur impurities, the sulphur is oxidized to form sulphur oxide when these are burned. The burning of fossil fuel is the main cause of nitrogen oxide pollution. Column I Column II (a) Carbon dioxide (iii) GHG (Green house gas) (b) Nitrogen fixation (i) Bacteria (c) CFCs (Chlorofluorocarbons) (ii) ODS (Ozone depletion substances) (d) Decomposers (v) Mineralization (e) Oxides of nitrogen and sulphur (iv) Fossil fuel

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The main gas responsible for the Green House effect is :

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Important Questions on Pollution of Air and Water

EASY

Science>Biology>Pollution of Air and Water>Greenhouse Effect

In resonance hybrid of ozone molecule,

O - O

bond length is

EASY

Science>Biology>Pollution of Air and Water>Greenhouse Effect

The average temperature of the earth's atmosphere is gradually increasing. This is called _____.

EASY

Science>Biology>Pollution of Air and Water>Greenhouse Effect

Single Matching. Match the articles of column I and column II

Column I	Column II
(a) Carbon dioxide	(i) Bacteria
(b) Nitrogen fixation	(ii) ODS (Ozone depletion substances )
(c) CFCs (Chlorofluorocarbons)	(iii) GHG (Greenhouse gas)
(d) Decomposers	(iv) Fossil fuel
(e) Oxides of nitrogen and sulphur	(v) Mineralization