Band 7.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 7.5 · Cambridge IELTS 19 · 2026-09-16

IELTS Writing Task 1 question

 

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.

Student answer (Band 7.5)

The diagram illustrates the process of producing ethanol from plant material and shows how carbon dioxide is recycled throughout the process.

Overall, ethanol production is a cyclical process consisting of several stages, beginning with the growth and harvesting of plants and ending with the use of ethanol as a fuel. A key feature is that carbon dioxide released during production and fuel consumption is reabsorbed by plants.

Initially, plants and trees grow using sunlight and carbon dioxide. Once mature, they are harvested and undergo pre-processing, which converts the raw material into cellulose. This cellulose is then processed further to produce sugars.

Next, microbes are added to the sugars, resulting in the production of ethanol. The biofuel is subsequently used by cars, trucks and aircraft, which release carbon dioxide when they burn it.

Finally, the carbon dioxide returns to the atmosphere and is absorbed by growing plants. Thus, the process forms a continuous cycle, with carbon dioxide linking plant growth and ethanol consumption.

AI examiner evaluation

Task Achievement / Task Response — Band 7.5

The response fully satisfies the requirements of Academic Task 1 by providing a clear and comprehensive summary of the diagram illustrating ethanol production. The overview effectively captures the main features, noting both the cyclical nature of the process and the carbon dioxide recycling loop. All key stages are reported accurately in logical sequence, from plant growth and harvesting through pre-processing, cellulose extraction, sugar processing, and the addition of microbes, down to the final utilization and combustion of ethanol in vehicles. No data is invented or misread, and the relationship between fuel consumption and carbon dioxide release is accurately captured. The response demonstrates a clear understanding of the visual data without unnecessary padding.

Coherence and Cohesion — Band 7.5

The response is exceptionally well-structured and easy to follow. Ideas are logically sequenced, following the chronological flow of the diagram from start to finish. Paragraphing is used appropriately and effectively, separating the introduction and overview from the distinct stages of the process. Cohesive devices such as 'Initially', 'Once mature', 'Next', 'subsequently', and 'Finally' are used naturally and precisely to guide the reader through the cycle without becoming mechanical. Referencing throughout the text is clear and precise, ensuring that the relationships between the stages and the carbon dioxide loop remain transparent.

Lexical Resource — Band 7.5

The student demonstrates a wide and appropriate vocabulary range well-suited to describing a technical or scientific process. Less common and precise lexical items are utilized effectively, such as 'cyclical process', 'reabsorbed', 'pre-processing', 'microbes', and 'continuous cycle'. Word choices and collocations are generally accurate and reflect a natural control of language. There are no notable spelling or word-choice errors, and the vocabulary employed allows the writer to convey precise meanings smoothly and effectively.

Grammatical Range and Accuracy — Band 7.5

The writing exhibits a wide range of complex grammatical structures used with a high degree of accuracy. The student skillfully employs subordinate clauses, participial phrases ('beginning with the growth...', 'which converts the raw material...'), and passive constructions appropriate for process descriptions. The majority of sentences are completely error-free, and control over punctuation and tense consistency is strong throughout. Minor slips are virtually absent, and the grammar never impedes communication or smooth reading.

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