Band 6.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 6.0 · Cambridge IELTS 19 · 2026-10-12

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 6.0)

The process diagram illustrates the production of biofuel that how the ethanol is produced.

Overall, it consists of several steps, starting from growing of plants and trees by consumption of energy from sunlight and carbon-dioxide and ending with production of ethanol, which is used by vehicles.

Firstly, the plants and trees grow with the help of energy from direct sunlight and carbon-dioxide. These are the primary source of biogas. After that, the process of harvesting takes place by farmer and is transported to the pre-processing unit. Cellulose, a by-product is driven out, after the pre-processing of the chopped trees.

Subsequently, the cellulose is processed in a factory, where the chemically procedure occurred and transformed into sugar. The sugar is then added by microbes, where the fermentation starts and finally the ethanol is produced. Then, the ethanol is utilized by the various types of vehicles, as a result there is emission of carbon-dioxide from the exhausts, that will be re-utilized by the trees as a source of energy.

AI examiner evaluation

Task Achievement / Task Response: Band 6.5

You cover the main stages in a clear sequence, from plant growth and harvesting through processing, microbial action and ethanol use. The overview also identifies the cycle’s beginning and end, and you correctly note that carbon dioxide from transport is reused by plants. This gives the response a solid account of the process. However, some details are inaccurate or insufficiently precise: the diagram shows cellulose as an intermediate material, not a by-product “driven out,” and it does not specify that the trees are chopped or that fermentation starts. The overview could also make the circular nature of the process more explicit. To strengthen the report, describe only what the diagram shows and distinguish the production stages from the carbon-dioxide cycle more clearly.

Coherence and Cohesion: Band 6.5

The response is organised into an opening, an overview and a sequence of stages, with “Firstly,” “After that” and “Subsequently” helping the reader follow the process. The progression from plant growth to vehicle use is generally logical, and the final reference to carbon dioxide returning to the trees provides a useful link back to the start. Some connections are less clear, however: “These” in “These are the primary source” has an uncertain reference, and “Cellulose, a by-product is driven out” makes the relationship between pre-processing and cellulose difficult to follow. The sequence markers also feel somewhat mechanical. Use clearer references and connect each stage directly to its input and output; a more explicit overview of the cycle would improve the overall progression.

Lexical Resource: Band 6.0

You use a relevant range of process vocabulary, including “harvesting,” “pre-processing,” “cellulose,” “microbes” and “emission,” which helps communicate the stages. Some less common terms are attempted, but several choices are inaccurate or do not collocate naturally. “Biogas” is not the fuel identified in the diagram, “driven out” is unsuitable for describing cellulose as an output, and “chemically procedure” is an awkward phrase. “Re-utilized” communicates the idea but is less natural than “reabsorbed” or “reused” in this context. These choices do not prevent the reader from understanding the general process, but greater precision and more natural combinations would improve the description. Prefer straightforward process verbs such as “produces,” “is converted into” and “is released.”

Grammatical Range and Accuracy: Band 5.5

You attempt both simple and complex sentences, including clauses with “where” and a final result clause, and the overall meaning remains understandable. However, some grammatical errors affect clarity and control. The opening phrase “the production of biofuel that how the ethanol is produced” has an incorrect clause structure; “by farmer” is missing an article or plural form; and “the chemically procedure occurred” has problems with word form and tense. There are also awkward passive constructions, such as “The sugar is then added by microbes,” and the final sentence joins several ideas with a comma. Aim for accurate subject–verb patterns and use passive forms where appropriate: for example, “Microbes are added to the sugars, producing ethanol.” Breaking the final sentence into two would also help punctuation.

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

Browse more IELTS Writing model answers or get your own writing scored by the same AI examiner.