Band 6.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 6.5 · Cambridge IELTS 19 · 2026-10-07

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 6.5)

The diagram illustrates the procedure required to produce biofuel called ethanol from plants and trees.

Overall, it is clearly seen that production of biofuel starts from grown plants and after emission release carbon dioxide in environment which helps the plant to grow, which makes a closed circle of production and consumption.

First, plants and trees use sunlight and carbon dioxide to grow. The fully grown plants harvested and sent for pre-processing. After pre-processing harvested crops divided into small pieces which is called cellulose. These cellulose structures further sent through processing in labs and turns into sugars.

Probing further, in next step microbes will be added in sugars which converts it into the ethanol. This produced ethanol is further used in different kind of vehicles such as car, truck and airplane engine to provide power. After emission of fuel vehicles release carbon dioxide in environment which further used by plants and trees as a source of energy to grow.

AI examiner evaluation

Task Achievement / Task Response: Band 7.0

You cover the main stages and give a clear overview of the cycle, noting that carbon dioxide released after ethanol is used returns to support plant growth. The sequence from harvesting through pre-processing, cellulose, processing, sugars, microbes and ethanol is also reported, and the transport uses are included. This gives the reader a clear account of the process. However, a few details are not fully faithful to the diagram: it does not say that crops are divided into small pieces to become cellulose, nor that processing takes place in laboratories. Also, the overview could identify the cycle more precisely as the relationship between plant growth, ethanol use in transport and carbon dioxide. More exact reporting of the labelled stages would strengthen an otherwise well-covered response.

Coherence and Cohesion: Band 7.0

The response is organised in a clear sequence: an introduction and overview are followed by the early production stages and then the conversion and use of ethanol. Linking expressions such as “First,” “After,” and “In next step” help the reader follow the process, and the final sentence returns to the cycle described in the overview. Paragraphing is appropriate and the progression is easy to understand. Some connections are less smooth, however: “Probing further” sounds unnatural as a transition in a process description, while “which further used” leaves the relationship between carbon dioxide and plant growth unclear. Use straightforward sequencing and clearer reference, for example, “The carbon dioxide released by these vehicles is then absorbed by growing plants.”

Lexical Resource: Band 6.0

You use a suitable range of process vocabulary, including “pre-processing,” “cellulose,” “microbes,” “ethanol,” and “emission,” which allows you to describe the main stages without excessive repetition. Some choices are imprecise or do not collocate naturally: “emission release carbon dioxide,” “different kind of vehicles,” and “provide power” are less effective ways to describe the diagram. “Probing further” is also an awkward phrase in this context. Aim for accurate, natural combinations such as “carbon dioxide is released,” “various forms of transport,” and “used as fuel.” The vocabulary is adequate for the task, but greater precision and more consistent control of collocation would make the description clearer and more fluent.

Grammatical Range and Accuracy: Band 5.5

You attempt a mixture of simple and complex sentences, including clauses with “which” and “after,” and the overall meaning remains understandable. However, some grammatical errors recur. For example, “The fully grown plants harvested” needs a passive verb (“are harvested”), and “These cellulose structures further sent” also lacks a verb. There are agreement and tense problems in “microbes will be added in sugars which converts it,” where the process should be described consistently in the present and the verb should agree with its subject. The sentence beginning “Overall” also has an unclear construction around “after emission release.” Practise accurate passive forms and present-simple descriptions of processes, while checking subject–verb agreement and sentence boundaries.

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