Process Diagram

Band 8+: Biofuel production: how ethanol is made. Write at least 150 words.

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Image for topic: Biofuel production: how ethanol is made. Write at least 150 words.

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The image illustrates ethanol production from biofuel starting with energy (sunlight + carbon dioxide) aiding plant/tree growth; this is followed by harvesting, and pre-processing which releases carbon dioxide; processing involves breaking down cellulose into sugars; microbes are added to convert sugars into ethanol; ethanol is used as a fuel, releasing carbon dioxide again in the process.

Given the complexity of the image, the above description may not be entirely accurate.

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The diagram illustrates the process of producing ethanol from plants and extracts can use as biofuel. Carbon dioxide is recycled throughout the production cycle.

Overall, ethanol is produced through a series of stages beginning with the growth of plants and ending with its use as a transport fuel. Carbon dioxide released during production and combustion is reabsorbed by plants, making the process a continuous cycle.

Initially, plants and trees grow by using sunlight and carbon dioxide from the atmosphere, after they have matured, they are harvested and sent for processing. When the raw plant material is then converted into cellulose, which is transferred to a processing plant during processing, the cellulose is broken down into sugars.

In the next stage, microbes are added to the sugars to produce ethanol through fermentation. The finished biofuel is then used to power various forms of transport, including cars, trucks and aircraft. Ethanol is burned, carbon dioxide is released into the atmosphere. In addition, some carbon dioxide is emitted during the Pre-processing phase. Finally, this carbon dioxide is absorbed by growing plants, allowing the cycle to begin again.

Word Count: 184

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Overall Band Score

(+/- 0.5)

Vocabulary Complexity:
C2 - Complex
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Grammar Mistakes: N/A

Vocabulary Repetition:

carbon: 6

dioxide: 6

plants: 5

ethanol: 4

during: 3

processing: 3

Try using synonyms for the above words

Task Response

The report fully satisfies the requirements of the task. It provides a clear overview of the cyclical nature of the process and accurately describes each stage from plant growth to fuel combustion. The progression of information is logical, and the inclusion of the carbon dioxide cycle demonstrates a high level of task achievement. The response is well-structured and uses appropriate terminology to describe the biological and mechanical stages.

Coherence & Cohesion

The report is very well-organized, following a logical progression from the initial growth stage to the final combustion stage. The use of cohesive devices such as 'Initially', 'In the next stage', and 'Finally' helps the reader navigate the process easily. To reach a higher band, ensure that the transition between sentences within paragraphs is even more seamless, avoiding slightly repetitive sentence structures.

Lexical Resource

The vocabulary used is appropriate and varied, with terms like 'reabsorbed', 'combustion', 'matured', and 'fermentation' demonstrating a good command of topic-specific language. There is a slight awkwardness in the opening sentence ('extracts can use as biofuel'), which affects the natural flow. Aim for more precise phrasing when describing the relationship between materials and their uses.

Grammatical Range & Accuracy

The report demonstrates a good range of complex structures, including subordinate clauses and passive voice, which is essential for process descriptions. However, there are some issues with sentence construction, such as comma splices (joining two independent clauses with only a comma) and slightly clunky phrasing in the third paragraph. Paying closer attention to sentence boundaries and the connection between clauses will improve overall accuracy.

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