Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · Cambridge IELTS 19 · 2026-09-13

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)

The given picture illustrate how biofuel is produced.different steps are involved in making bio gas .let's analyse the processes involved production of gas .

First of all we see that plants and trees use sunlight and energy to grow .when we harvest the crop and during pre processing cellulose is separated.In next process,sugar is formed.Microbes are added in ethanol. We see carbon dioxide is emitted from vehicle's smoke .This carbon dioxide is used by plans .we get sugar and cellulose after processing the food .Microbes are added in ethanol.

The process of biogas is simple and we see carbon dioxide is playing a major role in composition of biogas . release of carbon from vehicles and reuse of it playing a vital role in composition of ethanol.The process is simple and elaborative.Air pollution is playing a vital role in ethanol preparation.The effects are dangerous for living being .

AI examiner evaluation

Task Achievement / Task Response — Band 4.5

The response attempts to summarise the diagram showing the production of ethanol, but it falls short of the minimum 150-word requirement, clocking in at 148 words. This results in a necessary penalty under Task Achievement. Furthermore, the content fails to fully report the main features and makes significant misinterpretations of the process, such as stating that 'microbes are added in ethanol' or confusing biological processes with vehicle emissions in a way that distorts the data shown in the prompt. While some steps like harvesting and cellulose separation are mentioned, key stages of the process sequence are missed, resulting in an underdeveloped and partially inaccurate overview.

Coherence and Cohesion — Band 4.0

The organisation of the text is severely hampered by poor paragraphing and informal conversational intrusions, such as 'let's analyse the processes involved production of gas.' Although cohesive devices like 'First of all' and 'In next process' are attempted, they are misused or lack grammatical precision. There is no clear logical progression guiding the reader through the cyclical or sequential stages of the diagram. Instead, sentences feel disjointed and repetitive, particularly regarding the mentions of carbon dioxide and simple processes, leading to an overall lack of structural coherence.

Lexical Resource — Band 4.5

The vocabulary used is very basic and repetitive, relying heavily on simple words such as 'process', 'simple', 'plants', and 'sugar'. There are notable lexical inaccuracies and awkward collocations, such as 'vehicle's smoke' and 'bio gas' versus 'ethanol'. Attempts to use less common vocabulary fail due to inaccurate usage or repetition of the same terms across short sentences. Spelling and word choice errors are frequent enough to occasionally impede clear communication, placing the response firmly in the lower-intermediate band.

Grammatical Range and Accuracy — Band 4.5

The text displays a very limited range of grammatical structures, consisting mostly of simple and occasionally faulty complex sentences. There are frequent punctuation and capitalisation errors, such as missing capital letters at the beginnings of sentences ('different steps', 'let's analyse') and run-on structures without proper punctuation ('when we harvest the crop and during pre processing cellulose is separated.In next process,sugar is formed'). Verb tense consistency is poorly maintained, and article usage is frequently omitted or incorrect. These recurring errors cause noticeable difficulty for the reader.

See this exact question answered at other band scores — the same prompt compared across bands.

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