Band 8.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.0 · Cambridge IELTS 19 · 2026-09-29

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 8.0)

The provided diagram illustrates the cyclical process by which a renewable biofuel known as ethanol is manufactured and consumed.

Overall, the production of ethanol is a continuous loop that combines biological growth, industrial processing, and fuel consumption. The entire procedure can be divided into three main stages: the cultivation and harvesting of raw materials, the chemical transformation into ethanol, and its utilization as a transportation fuel which naturally replenishes the carbon cycle. The cycle commences when plants and trees grow by utilizing solar energy and absorbing carbon dioxide from the atmosphere. Once mature, these plants are harvested using mechanical equipment such as tractors. The gathered biomass then undergoes a pre-processing stage to extract cellulose.

In the subsequent industrial phase, the extracted cellulose is sent to a processing facility where it is broken down and chemically converted into sugars. Following this, specific microbes are introduced to ferment the sugars, ultimately yielding ethanol. In the final stage, the finished biofuel is distributed to power various modes of transportation, including cars, trucks, and airplanes.

The combustion of ethanol in these vehicles releases carbon dioxide back into the atmosphere. This emission completes the closed-loop cycle, as the carbon dioxide is once again absorbed by growing plants and trees through photosynthesis.

AI examiner evaluation

Task Achievement / Task Response: Band 8.0

The student provides a very thorough and well-structured overview of the process diagram illustrating how ethanol is made. All main stages are accurately reported, from the initial growth of plants and trees using solar energy and carbon dioxide, through harvesting, pre-processing, cellulose extraction, and processing into sugars, to the addition of microbes and the final production of ethanol. Furthermore, the response correctly identifies the cyclical nature of the process by mentioning the utilization of ethanol in vehicles and the subsequent release of carbon dioxide back into the atmosphere. No information is invented or misread, demonstrating an excellent understanding of the visual data.

Coherence and Cohesion: Band 8.0

The response is exceptionally well-organized and logically sequenced, following the chronological flow of the cycle effortlessly. Cohesive devices are used naturally and flexibly, such as 'Once mature', 'In the subsequent industrial phase', and 'Following this', which guide the reader smoothly from one stage of the process to the next. Paragraphing is used appropriately to separate the introduction, the preliminary stages, the industrial conversion, and the final consumption and carbon cycle replenishment. Referencing is clear throughout, and there is no mechanical feel to the progression of ideas.

Lexical Resource: Band 7.5

The writer demonstrates a wide and flexible vocabulary suitable for an academic process description. Less common and precise lexical items are employed skillfully and naturally, such as 'cyclical process', 'renewable biofuel', 'cultivation', 'biomass', 'subsequent industrial phase', and 'replenishes the carbon cycle'. Word choice and collocations are accurate throughout, and there are no spelling or word-formation errors. The range of vocabulary allows the student to convey precise technical and environmental concepts with ease.

Grammatical Range and Accuracy: Band 8.0

The response features a wide range of complex grammatical structures used with a very high degree of accuracy. The writer successfully employs participial phrases ('by utilizing solar energy', 'depicted as a factory'), subordinate clauses ('when plants and trees grow', 'as the carbon dioxide is once again absorbed'), and passive constructions ('is manufactured', 'are harvested'). The majority of sentences are completely error-free, and punctuation is handled with precision. Control over grammar is exceptionally strong throughout the entire text.

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