Question 11.
Answer the following.
Which fuels can be obtained by microbial processes? Why is it necessary to increase the use of such fuels?
Answer:
i. Gaseous fuel- methane can be obtained by microbial anaerobic decomposition of urban agricultural and industrial waste.
ii. Ethanol, an alcohol is a clean (smokeless) fuel obtained during fermentation of molasses by the yeast- Saccharomyces.
iii. Hydrogen gas is considered to be the fuel of future. Hydrogen gas is released during bio-photolysis of water in which bacteria perform the photo-reduction.
It is necessary to increase the use of these fuels so that the fuels that are obtained from the non-renewable energy sources can be conserved. Also, air pollution can be reduced.
