The diagram below shows how a biofuel called ethanol is produced.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
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Circular process diagram for ethanol biofuel. Plants and trees grow using sunlight and carbon dioxide, are harvested and pre-processed, then their cellulose is processed into sugars. Microbes are added to the sugars to produce ethanol, which fuels cars, lorries and aircraft. These vehicles and the pre-processing stage release carbon dioxide, which returns to the atmosphere and is absorbed during new plant growth.
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Estimated band7.5
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Response 01
196 words
The diagram illustrates the process by which ethanol, a type of biofuel, is produced from plant-based materials.
Overall, the production of ethanol involves a circular sequence beginning with the growth of plants and ending with ethanol being used as fuel in various modes of transportation. While carbon dioxide is emitted during the process, it is also absorbed at the start, making it a relatively sustainable cycle.
To begin with, plants and trees grow by absorbing sunlight and carbon dioxide through photosynthesis . Once mature, these crops are harvested and taken to a pre-processing facility where they are broken down into smaller parts. During this stage, the cellulose content of the plant matter is extracted, which serves as the key raw material for the next step.
In the subsequent processing phase, cellulose is converted into sugars, which are then fermented with the addition of specific microbes. This fermentation process results in the production of ethanol. Finally, the ethanol is distributed and utilized as a fuel for vehicles such as cars, trucks, and airplanes. While these vehicles release carbon dioxide into the atmosphere, it is offset to some extent by the CO₂ absorbed during the initial plant growth phase.
Estimated band8.0
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Response 02
254 words
The diagram illustrates the cyclical process involved in producing ethanol, a type of biofuel, from plant materials.
Overall, the biofuel production cycle consists of three primary stages: harvesting and pre-processing plant materials, chemically converting them into ethanol, and utilizing the fuel for transportation, with the cycle then recommencing.
At the outset of the process, plants and trees undergo growth, fueled by sunlight and absorbing carbon dioxide from the atmosphere. Once matured, they are mechanically harvested and fed into a pre-processing machine. This machine breaks down the plant materials into smaller components, primarily cellulose, through a series of mechanical and chemical processes.
Moving to the second stage, the extracted cellulose undergoes transportation to a laboratory, where it undergoes chemical processing to convert it into sugars. These sugars are crucial for the subsequent fermentation process. Microbes, introduced into the sugars, facilitate fermentation, resulting in the production of ethanol as a byproduct.
Finally, the ethanol produced in the previous stage is utilized as a fuel source for various modes of transportation, such as cars, trucks, and airplanes. During this utilization phase, ethanol undergoes combustion, releasing carbon dioxide back into the atmosphere. This carbon dioxide is then reabsorbed by plants and trees, restarting the cycle.
In conclusion, the production of ethanol from plant materials involves a cyclical process encompassing harvesting and pre-processing, chemical conversion into ethanol through fermentation, and utilization as a fuel source for transportation. This process highlights the sustainability of biofuels in reducing carbon emissions by maintaining a continuous cycle of carbon dioxide absorption and release.
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