How Ethanol is Produced: A Diagram Explained
Overview
This essay describes the process of ethanol production from plants and trees, as illustrated in a diagram. The process involves nine stages, starting from growing plants using sunlight and carbon dioxide, to harvesting, processing, and ultimately using the ethanol to fuel vehicles. The cycle completes with the vehicles emitting carbon dioxide, which is then used by the plants for photosynthesis. The essay outlines the main steps but lacks detail in explaining the technical aspects of cellulose conversion and the role of microbes.
Key Features
- Nine-stage process from plant growth to fuel usage.
- Highlights the role of sunlight and carbon dioxide in plant growth.
- Mentions harvesting and pre-processing of plants into cellulose.
- Describes sugar extraction and the use of microbes to produce ethanol.
- Explains ethanol's use in vehicles and the subsequent carbon dioxide emission, completing the cycle.
Our Review
The essay provides a basic overview of ethanol production, but it needs significant improvement. The description lacks depth and precision, particularly in explaining the chemical processes involved. The writing style is simplistic, and the grammar contains noticeable errors that detract from the clarity of the explanation. The essay would benefit from more specific vocabulary and a more detailed elaboration of each stage in the process. We believe the author needs to focus on improving grammatical accuracy and expanding their vocabulary related to scientific processes.
Student Submission
The given diagram illustrates how a specific biofuel called " Ethanol" is produced. Overall, there are nine main stages to generate ethanol, starting with growing trees and plants, and ending with supplying ethanol for various types of transportations and vehicle. At the beginning, plants and trees need sunlight and carbon dioxide to grow up. When they become mature enough the farmers harvest them and they go into a machine to slice or cut it onto small pieces to get cellulose and this process is called " pre-processing". After that they are transported to factories or labs to extract sugar from cellulose; which contain microbes that are added to make ethanol and it is used to fuel many motors vehicle such as: cars, trucks, and airplanes. Eventually those transportations emit carbon dioxide to the air so the plants and trees can do “photosynthesis”, then we go again with the same process.
IELTS Essay Assessment
1. IELTS Writing Score: 5/9 ■■■■■□□□□
2. Score Breakdown:
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Task Achievement: 5/9 - The essay describes the process, but lacks detail and precision in several stages. The cyclical nature of the process is mentioned but not clearly explained or developed. The description is somewhat simplistic and omits crucial details about the conversion of cellulose to sugar and the role of microbes.
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Coherence and Cohesion: 5/9 - The essay follows a logical sequence of steps, but the connections between some stages are unclear. Paragraphing could be improved to enhance clarity and flow. The use of cohesive devices is limited and somewhat inconsistent.
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Lexical Resource: 5/9 - The vocabulary is adequate but lacks range and precision. Some words are used inappropriately (e.g., "motors vehicle"). There is some repetition of vocabulary.
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Grammatical Range and Accuracy: 5/9 - The grammar contains several errors, including sentence structure, article usage, and tense consistency. While the basic grammar is understandable, more complex grammatical structures are rarely used.
3. Error Analysis:
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Vocabulary Errors:
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motors vehicle] -> [ motor vehicles ] : "Motor vehicles" is the correct plural form. "Motors vehicle" is grammatically incorrect. - [
grow up] -> [ grow ] : While plants grow, "grow up" is typically used for people or animals. "Grow" is sufficient here. - [
it is used to fuel many motors vehicle] -> [ it is used as fuel for many motor vehicles ] : This improves clarity and word choice.
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Grammar Errors:
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When they become mature enough the farmers harvest them and they go into a machine to slice or cut it onto small pieces to get cellulose] -> [ When mature enough, the plants are harvested and processed in a machine that slices them into small pieces to obtain cellulose.] : This corrects the sentence structure and improves clarity and flow. It also avoids unnecessary repetition. - [
which contain microbes that are added to make ethanol] -> [ to which microbes are added to produce ethanol ] : This is a more grammatically correct and sophisticated way to express the idea. - [
Eventually those transportations emit carbon dioxide to the air so the plants and trees can do “photosynthesis”, then we go again with the same process.] -> [ The carbon dioxide emitted by these vehicles then contributes to the photosynthesis process, restarting the cycle.] : This corrects the awkward phrasing and improves the overall flow. The use of "restart the cycle" is more concise and accurate.
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4. English Model Essay:
The diagram illustrates the cyclical process of ethanol production from plants. The process begins with the growth of plants, which utilize sunlight and carbon dioxide for photosynthesis. Once mature, these plants are harvested and undergo pre-processing, a stage involving the mechanical breakdown of plant material into smaller pieces to expose the cellulose. This cellulose is then transported to a factory where it is converted into sugar through a process not detailed in the diagram. Microbes are introduced to this sugar solution to ferment it, producing ethanol. This ethanol is then used as fuel for various transportation methods, including cars, trucks, and airplanes. The carbon dioxide released during the combustion of this ethanol is subsequently utilized by plants for photosynthesis, thus completing the cycle. The diagram does not show the specifics of the cellulose-to-sugar conversion, which would further enhance the understanding of the entire process.
