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Ethanol fuel from corn: IELTS Task 1 answer #6, band 7.0

A student’s answer to this repeated IELTS question, shared without their name and marked by Axiom on the four criteria. Select a highlighted passage to see how it could be revised, and why.

160 words. Marked by Axiom on 26 July 2026. Estimated by AI. It isn’t an official IELTS score.

The process this answer describes

Ethanol fuel from corn: the stages in order
  1. Corn
  2. Storing
  3. Milling
  4. Cooking (4 hours)
  5. Fermenting (48 hours)
  6. Separating
  7. Purifying Ethanol (5 hours)
  8. Storing
  9. Transporting

Academic Task 1160 words

The diagram shows how ethanol fuel is produced from corn

The diagram illustrates the production of ethanol fuel from corn.

Overall, corn undergoes several distinct stages before it is transformed into ethanol fuel, beginning with storing corn and ending with delivering the ready-to-use ethanol fuel to the gas station.

  1. Coherence & cohesion

    RevisedNotably, the process is fully automated and does not require manual labor.

    This revision improves cohesion and removes unnecessary emphasis.

  2. Coherence & cohesion

    RevisedThe entire process, which includes milling, cooking, fermenting, separating, purifying, and storing, takes around 57 hours in total.

    This revision clarifies the process duration and avoids repetition.

Afterwards, the stored corn is milled,

  1. Coherence & cohesion

    RevisedInitially, corn is harvested and placed in storage facilities.

    This revision streamlines the sentence for better flow.

  2. Grammar & accuracy

    Revisedbefore being cooked with water for about 4 hours, after which it is fermented for approximately 48 hours.

    This revision clarifies the sequence and improves sentence structure.

Subsequently, once the fermented mixture is , it undergoes a purification process for 5 hours.

  1. Lexical resource

    Revisedseparated into a liquid component and a solid by-product

    This revision clarifies the distinction between the two outputs.

  2. Grammar & accuracy

    RevisedIn the final step, the purified ethanol fuel is transported to gas stations by truck.

    This revision simplifies the sentence and corrects the vocabulary.

Select a highlighted passage to see its suggested revision.

Estimated by AI. It isn’t an official IELTS score.

What Axiom wrote for each criterion: why the answer earned its band, and what to work on next.

Coherence & cohesion

Band 7.0/ 9

The essay follows a logical sequence and effectively organizes the information according to the diagram. Paragraphing is clear, and there is a good use of linking words such as 'afterwards,' 'subsequently,' and 'finally.' However, some transitions could be smoother, and there is slight repetition in describing the process duration.

Suggestions

  • Use more varied linking phrases to enhance flow.
  • Avoid unnecessary repetition of process duration.
  • Clarify the sequence of steps for better readability.

Sentence revisions 3

  • RevisedThe entire process, which includes milling, cooking, fermenting, separating, purifying, and storing, takes around 57 hours in total.

    This revision clarifies the process duration and avoids repetition.

  • RevisedNotably, the process is fully automated and does not require manual labor.

    This revision improves cohesion and removes unnecessary emphasis.

  • RevisedInitially, corn is harvested and placed in storage facilities.

    This revision streamlines the sentence for better flow.

Grammar & accuracy

Band 7.0/ 9

The essay demonstrates a good range of sentence structures and mostly accurate grammar. There are some minor errors, such as awkward phrasing and comma misuse, but these do not impede understanding.

Sentence revisions 3

  • RevisedNotably, the process is thoroughly machine-driven, requiring no human intervention.

    Removed the unnecessary space before the comma.

  • Revisedbefore being cooked with water for about 4 hours, after which it is fermented for approximately 48 hours.

    This revision clarifies the sequence and improves sentence structure.

  • RevisedIn the final step, the purified ethanol fuel is transported to gas stations by truck.

    This revision simplifies the sentence and corrects the vocabulary.

Lexical resource

Band 7.0/ 9

The vocabulary is appropriate and mostly varied, with some attempt at using less common expressions such as 'heavy-duty lorries' and 'machine-driven.' However, there are minor inaccuracies and some repetition.

Sentence revisions 3

  • Revisedfully automated

    'Fully automated' is a more precise and natural term in this context.

  • Revisedtransported to gas stations by trucks.

    'Trucks' is a more general and commonly used term in IELTS writing.

  • Revisedseparated into a liquid component and a solid by-product

    This revision clarifies the distinction between the two outputs.

Task achievement

Band 8.0/ 9

The essay accurately describes the main stages of ethanol production from corn as shown in the diagram. All key steps are mentioned, and the process is summarized well. However, the essay could be improved by mentioning the separation of liquid and solid by-products more clearly and by providing a more precise total duration of the process.

Suggestions

  • Mention the separation of liquid and solid by-products more explicitly.
  • Provide a more accurate calculation of the total process duration.
  • Include all key features from the diagram, such as the storage step before delivery.

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