Band 4.5 IELTS Writing Task 1 Model Answer
Overall Band Score: 4.5 · Cambridge IELTS 19 · 2026-09-23
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 4.5)
This diagram shows that how ethanol is produced by biofuel.
Firstly we grow plants and trees with the energy of sunlight and carbon dioxide.After that we harvest the crops ans start the pre processing of plants and trees.Then all the materail converted into cellulose.
After that to start the process of making sugar. By the use of carbon dioxide sugar converted into microbes. Completing the process microbes then transfer to Ethanol.
That is used in cars, trucks and airoplane. Furthermore the vehicles runs throw carbon dioxide that is release from Ethanol.
AI examiner evaluation
| Criterion | Band |
|---|---|
| Task Achievement / Task Response | 4.0 |
| Coherence and Cohesion | 5.0 |
| Lexical Resource | 4.0 |
| Grammatical Range and Accuracy | 4.0 |
| Overall | 4.5 |
Task Achievement / Task Response: Band 4.0
The student attempts to describe the biofuel production process shown in the diagram, identifying key stages such as growing plants, harvesting, pre-processing, and processing into sugars and ethanol. However, the response is severely restricted by length, containing only 91 words, which falls well short of the 150-word minimum requirement. Furthermore, there are several misreadings of the diagram's process flow; for instance, stating that 'sugar converted into microbes' and 'microbes then transfer to Ethanol', whereas microbes are added to the sugars to produce ethanol. Because the response is under-length and lacks a comprehensive, accurate overview of the entire cyclical process, it meets the descriptors for Band 4.0.
Coherence and Cohesion: Band 5.0
The text is divided into short paragraphs, attempting to follow the sequential stages of the diagram. Basic cohesive devices like 'Firstly', 'After that', and 'Furthermore' are used to link ideas. However, the paragraphing is irregular and choppy, with some single-sentence paragraphs. Logical progression is occasionally disrupted by confusing phrasing and inaccuracies in how the steps connect to one another. Overall, the organization is basic and mechanical, fitting the Band 5.0 descriptors.
Lexical Resource: Band 4.0
The vocabulary used is very basic and repetitive, with several spelling errors ('ans', 'materail', 'airoplane', 'throw' instead of 'through'). While some topic-specific words from the prompt are utilized ('ethanol', 'biofuel', 'harvest', 'cellulose', 'microbes'), the student struggles with word formation and collocation, such as 'pre processing of plants and trees' and 'vehicles runs throw carbon dioxide'. The limited range and frequent lexical errors reflect Band 4.0.
Grammatical Range and Accuracy: Band 4.0
The student attempts a mix of simple and complex sentence structures, but control is weak. There are frequent grammatical errors, such as the opening fragment ('This diagram shows that how ethanol is produced by biofuel.'), missing articles, and incorrect preposition use. Punctuation is also inconsistent, with missing spaces after commas and periods. Due to the frequent errors that occasionally impede understanding and the limited range of accurate structures, the writing corresponds to Band 4.0.
See this exact question answered at other band scores. The same prompt compared across bands.
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