When vegetable matter decays at the bottom of lakes and ponds where there is limited air, it gives rise to 'marsh gas', which is:

oxygen

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chlorine

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butane

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methane

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Solution

The correct option is A methane
(i) Marsh gas is a mixture of methane, hydrogen sulfide and carbon dioxide which has methane at high percentage compared to the other two compounds.
(ii) Marsh gas is produced naturally in flooded regions.
(iii) This condition allows anaerobic digestion and fermentation of organic matter which produces methane

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