Question:

Name two fuels obtained by microbial processes. Why is it necessary to increase the use of such fuels?

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Microbial fuels like biogas and ethanol are eco-friendly alternatives to fossil fuels and can help reduce waste while promoting sustainability.
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Solution and Explanation

  1. Biogas: It is produced by microbial digestion of organic matter such as food waste, manure, and sewage. The microbes break down these materials in an anaerobic environment to produce methane.
  2. Ethanol: Produced through the fermentation process, where microorganisms like yeast convert sugars into ethanol and carbon dioxide. It is commonly used as a biofuel in vehicles.
Reason for Increasing the Use of Microbial Fuels:
  1. Sustainability: Microbial fuels are renewable sources of energy, unlike fossil fuels, which are finite and depleting.
  2. Environmental Benefits: Microbial fuels like biogas and ethanol produce fewer greenhouse gases and are less polluting compared to conventional fuels, helping in the fight against climate change.
  3. Waste Reduction: The production of these fuels utilizes organic waste, turning it into valuable energy, thus reducing environmental pollution and waste accumulation.
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