Process Diagram

Band 5+: 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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[17:55, 12/8/2025] Sara Piriyeva: The diagram illustrates the cyclical process which detail how biofuel ethanol manufactured.

Looking from an overall perspective, the 9 steps process begins with absorption of carbon dioxide by plants, continued chemical processing and ends with the emission of the carbon dioxide

In the first step, energy, sunlight and carbon dioxide, in the trees is harvested by machines. Then, logs enter pre-processing step, which is grinded the wood and logs turn the cellulose. In the next step, the cellulose is sent to processing, where it is converted into sugar.

After this step, microbes are added to convert these sugars into ethanol. At the final stage, this fermentation is complete, and ethanol as a biofuel used in various vehicles, including cars, trucks, and planes. During its use these vehicles release CO2 which is absorbed by plants and these all steps are repeated.

[19:15, 12/8/2025] Sara Piriyeva:

Word Count: 148

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Overall Band Score

5.5

(+/- 0.5)

Vocabulary Complexity:
C1 - Intricate
Strive to incorporate even richer and more precise language.

Grammar Mistakes: N/A

Vocabulary Repetition:

which: 3

ethanol: 3

carbon: 3

these: 3

Try using synonyms for the above words

Task Response

The report adequately covers the process of ethanol production from biofuel, hitting the key stages. There is a generally clear progression through the stages, although some of the language is a little awkward and could be more precise. To improve, focus on using more precise language and ensuring a smoother flow between the stages described. Also, try to include more detail where possible without making the report too long. The report falls short of the required 150 words.

Coherence & Cohesion

The report provides a general overview and attempts to follow the process sequentially. However, the description lacks clarity in places, and the flow could be improved with better transitions between steps. Consider using more cohesive devices to link ideas and ensure a smoother reading experience. Paragraphing is adequate but could be refined to group related steps more logically.

Lexical Resource

The vocabulary is generally appropriate for the task, but there's room for improvement in terms of precision and variety. For example, using more specific terms related to biofuel production could enhance the report. Avoid repetition by using synonyms where appropriate.

Grammatical Range & Accuracy

The report contains several grammatical errors that affect clarity. There are issues with verb tense consistency, subject-verb agreement, and article usage. Sentence structure is relatively simple, and expanding the range of sentence types would improve the overall quality. Proofreading carefully for grammatical errors is essential.

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