Band 7.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 7.5 · IELTS Momentum Workout · 2026-09-25

IELTS Writing Task 1 question

The diagram below shows how a mechanical arm works, and how the joints that make up the arm function in the same way as those in a human arm. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Student answer (Band 7.5)

The diagram illustrates the operational mechanism of a mechanical arm and demonstrates how its joints function similarly to those of a human arm.

Overall, the mechanical arm mimics human anatomy through specific joint functions and end-effectors, with its movement powered by individual motors under precise computer control. Additionally, the end section can be customized for different tasks.

Looking at the main structure, the device rests on a base that is usually stationary, though occasionally movable. Attached to this base are the pivot, which enables rotational movement, and the shoulder joint, which raises and lowers the arm. Moving along the structure, the elbow joint provides flexibility and movement, while the wrist allows the attached tool to flex and rotate.

In terms of control and execution, a computer sends precise signals to three individual motors, each connected to specific functional areas (the elbow, wrist, and end piece). The standard end piece is a gripper equipped with built-in sensors to control force. However, this can be swapped out for alternative end-effectors depending on the application, such as tools designed to spray paint, drill holes, or weld metal.

AI examiner evaluation

Task Achievement / Task Response: Band 7.5

The student has successfully covered all parts of the visual data by describing the main components of the mechanical arm, its control mechanism, and the alternative end-effectors. The overview clearly highlights the core functions, noting how the arm mimics human anatomy and is governed by computer-controlled motors. Details regarding the base, joints (pivot, shoulder, elbow, wrist), and the gripper are accurately reported without introducing irrelevant outside information. The information is logically selected and reported, meeting all the requirements of an Academic Task 1 response. Therefore, this warrants a band score of 8.0.

Coherence and Cohesion: Band 7.5

The response is logically organized with a clear overall progression. It begins with an introductory paragraph paraphrasing the prompt, followed by a concise overview. The body paragraphs are logically sequenced, transitioning smoothly from the physical structure of the base and joints to the control systems and end-effectors. Cohesive devices such as 'Additionally', 'Looking at the main structure', and 'In terms of control and execution' are used naturally and effectively to guide the reader through the explanation. Paragraphing is used appropriately, resulting in a cohesive and easy-to-read text that fits the Band 8 descriptor.

Lexical Resource: Band 7.5

The student demonstrates a wide and flexible vocabulary appropriate for describing a technical process. Terms such as 'operational mechanism', 'mimics human anatomy', 'customized', 'rotational movement', and 'alternative end-effectors' show sophisticated control over the lexical field. Word choice and collocations are accurate throughout, with only minor common items used where more precise ones could fit, though none of this impedes communication. The vocabulary range is robust and suits the academic context well, justifying a band 7.5 score rounded to 8.0 based on natural and accurate usage.

Grammatical Range and Accuracy: Band 7.5

The response features a wide range of sentence structures, seamlessly combining simple and complex forms (e.g., 'Attached to this base are the pivot, which enables rotational movement, and the shoulder joint...'). The majority of sentences are completely error-free, demonstrating excellent control over grammar, tense consistency, and punctuation. Modifiers and dependent clauses are handled skillfully without disrupting readability. The grammatical accuracy and variety easily align with the Band 8 criteria, as errors are virtually absent.

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

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