📚 Year 7 Edexcel Biology: Essay Writing Framework and Sample Essay | Year 7 Edexcel 生物：论文写作框架与范文
Writing about science is not just about showing what you know — it is about sharing your ideas clearly and logically. In Year 7 Edexcel Biology, you will often be asked to write a scientific report, an explanation, or a short essay. This article will give you a simple framework to follow and a full sample essay to help you see how it all fits together.
写科学文章不仅仅是展示你知道什么，更在于清晰、有逻辑地分享你的想法。在 Year 7 Edexcel 生物课程中，你经常会被要求写科学报告、解释说明或短文。这篇文章将给你一个简单易行的写作框架，并附上一篇完整范文，帮助你理解如何将它们组合起来。
1. What is Scientific Writing? | 什么是科学写作？
Scientific writing is a way of communicating ideas, investigations and conclusions in biology. It uses straightforward language, follows a set structure and always supports claims with evidence.
科学写作是一种在生物学中传达想法、研究和结论的方式。它使用直白的语言，遵循固定的结构，并且始终用证据支持自己的主张。
In Year 7, your writing might explain how the heart pumps blood, describe an experiment on photosynthesis or compare animal cells and plant cells. Whatever the topic, the goal is to be accurate and easy to understand.
在 Year 7，你写的内容可能涉及解释心脏如何泵血、描述一个光合作用实验或者比较动物细胞和植物细胞。无论主题是什么，目标都是要准确且易于理解。
2. The Basic Structure of a Scientific Report | 科学报告的基本结构
Most scientific reports in Year 7 Biology follow a simple version of the IMRaD model: Introduction, Method, Results and Discussion. You may also need a Title and a Conclusion.
Year 7 生物的大多数科学报告遵循简化版的 IMRaD 模式：引言、方法、结果、讨论。你还需要标题和结论。
Think of this structure as a story: what you wanted to find out, how you did it, what you saw and what it all means. Keeping to this order helps the reader follow your thinking step by step.
你可以把这个结构想象成一个故事：你想探究什么、你怎么做的、你看到了什么以及这一切意味着什么。按照这个顺序写作，能帮助读者一步步跟上你的思路。
| Section (部分) | Purpose (目的) | Key question (关键问题) |
|---|---|---|
| Title | Tells the reader exactly what the report is about | What did I investigate? |
| Introduction | Gives background information and states the aim | Why did I do this? What did I want to find out? |
| Method | Describes exactly what was done, step by step | How did I carry out the investigation? |
| Results | Presents measurements and observations clearly | What did I see and record? |
| Discussion | Explains what the results mean and evaluates the method | Why did this happen? How could I improve? |
| Conclusion | Sums up the main finding and relates it back to the aim | What is the answer to my question? |
3. Writing a Good Title | 如何写好标题
A strong title tells the reader the independent and dependent variables. It often follows the format: ‘The effect of [variable you change] on [variable you measure] in [organism or system]’.
一个好标题会告诉读者自变量和因变量是什么。它通常遵循这个格式：“[你改变的变量]对[你测量的变量]在[生物或系统]中的影响”。
For example, ‘The effect of light intensity on the number of oxygen bubbles produced by pondweed’ is much better than ‘Photosynthesis experiment’. In an essay, the title should still be clear and specific.
例如，“光照强度对水草产生氧气气泡数量的影响”比“光合作用实验”好得多。在论文或短文中，标题同样应该清晰具体。
4. Writing the Introduction | 撰写引言
Your introduction should start with some scientific background linked to the investigation. Use key words you have learned, such as ‘cells’, ‘respiration’ or ‘diffusion’, and explain them briefly.
引言应从与探究相关的科学背景开始。使用你学过的关键词，例如“细胞”“呼吸”或“扩散”，并简要解释它们。
Then state your aim clearly: what are you trying to find out? It is also good practice to include a prediction or hypothesis, for instance, ‘I predict that as light intensity increases, more oxygen will be produced because the rate of photosynthesis will speed up.’
然后清楚地陈述你的目的：你想要发现什么？最好还要包含一个预测或假设，例如：“我预测随着光照强度增加，会产生更多氧气，因为光合作用的速率会加快。”
5. Describing Your Method Clearly | 清晰描述方法
The method must be written as a series of logical steps so that another person could repeat your investigation exactly. Use numbered points or connectives such as ‘first’, ‘next’ and ‘finally’.
方法必须写成一系列符合逻辑的步骤，以便他人能够精确地重复你的探究。可以使用编号或“首先”“接下来”“最后”等连接词。
Include important details: the equipment used, the volumes measured, the temperatures kept constant and any safety precautions taken. In Year 7, you should start using sentences like ‘Measure 10 cm³ of water using a measuring cylinder’ rather than just ‘get water’.
要包含重要细节：使用的设备、测量的体积、保持恒定的温度以及采取的安全措施。在 Year 7，你应该开始使用“用量筒量取 10 cm³ 的水”这样的句子，而不只是说“取水”。
6. Presenting Your Results | 展示你的结果
Results are what you observed or measured. Use a table where the independent variable is in the first column and the dependent variable in the second. Tables must have clear headings with units, such as ‘Light intensity (lux)’ and ‘Number of bubbles per minute’.
结果是你观察到或测量到的内容。使用表格，将自变量放在第一列，因变量放在第二列。表格必须有带单位的清晰表头，例如“光照强度（lux）”和“每分钟气泡数”。
If you plot a graph, put the independent variable on the x‑axis and the dependent variable on the y‑axis. Do not forget to label the axes and give the graph a title. Write a sentence underneath the table or graph to describe the trend you see — but do not explain it yet.
如果画图，将自变量放在 x 轴，因变量放在 y 轴。别忘了给坐标轴加标签，并给图表起个标题。在表格或图表下方写一句话描述你看到的趋势——但先不要解释。
7. Discussing Your Findings | 讨论你的发现
The discussion is where you make sense of your results. Start by saying whether your results matched your hypothesis. Use your scientific knowledge to explain why you obtained those results.
讨论部分是你理解结果的地方。首先说明你的结果是否与假设相符。运用你的科学知识解释为什么得到了这些结果。
For example, you could write: ‘The number of bubbles increased because light is needed for the light‑dependent reaction of photosynthesis.’ Then evaluate your method: what worked well and what could be improved? Mention anomalies — results that do not fit the pattern — and suggest possible reasons for them.
比如，你可以写：“气泡数量增加是因为光合作用的光反应需要光。”然后评估你的方法：哪些地方做得好，哪些地方可以改进？提及异常值——不符合整体趋势的结果——并说明可能的原因。
8. Stating Your Conclusion | 陈述结论
A conclusion is not just a summary — it answers the original aim directly, using evidence from your results. Keep it short and focused. For example: ‘In conclusion, adding more light increased the number of bubbles, which supports the prediction that a higher light intensity produces a faster rate of photosynthesis.’
结论不仅仅是总结——它直接回答最初的目的，并用结果中的证据支持。结论要简短、聚焦。例如：“总之，增加光照提高了气泡数量，这支持了‘更高的光照强度会使光合作用速率加快’的预测。”
Never introduce new information in the conclusion. It should only refer back to what has already been presented in the report.
绝不要在结论中引入新信息。它只应回顾报告中已经呈现的内容。
9. Common Mistakes and How to Avoid Them | 常见错误及如何避免
One common mistake is writing ‘we’ or ‘I’ too often. In scientific writing, the passive voice is preferred: ‘The water was measured’ is better than ‘I measured the water’.
一个常见错误是过多使用“我们”或“我”。在科学写作中，倾向使用被动语态：“水被量取”比“我量取了水”更好。
Another mistake is mixing up results and discussion. Results section only reports what happened; the discussion explains it. Also, students sometimes forget to label units on tables and graphs. Without units, a measurement like ’56’ means nothing — is it 56 bubbles per minute, 56 centimetres or 56 seconds? Always include units.
另一个错误是混淆结果和讨论。结果部分只报告发生了什么；讨论部分进行解释。此外，学生有时忘记在表格和图表上标注单位。没有单位，像“56”这样的测量读数就毫无意义——是每分钟 56 个气泡、56 厘米还是 56 秒？一定要带上单位。
10. Sample Lab Report: Light and Plant Growth | 范文：光照与植物生长
Below is a sample report written using the framework. The investigation looks at how light affects the height of cress seedlings over seven days. Read through each section to see how the structure works in practice.
下面是一篇运用该框架写成的范文。这个探究考察了光照在七天内如何影响水芹幼苗的高度。通读每一部分，看看结构在实际中如何应用。
Title: The effect of light on the growth of cress seedlings over seven days
标题：光照对水芹幼苗七天生长的影响
Introduction: Plants use light energy to carry out photosynthesis, which makes glucose for growth. In this investigation, two groups of cress seeds were grown — one group was placed on a sunny windowsill, and the other was kept inside a dark cupboard. The aim was to find out how the presence or absence of light affects the height of seedlings. It was predicted that the seedlings kept in the light would grow taller because they could photosynthesise and produce more food.
引言：植物利用光能进行光合作用，制造用于生长的葡萄糖。本探究中，两批水芹种子被种植——一组放在有阳光的窗台上，另一组放在黑暗的橱柜里。目的是探究有无光照如何影响幼苗高度。预测在光照下生长的幼苗会长得更高，因为它们能进行光合作用，制造更多养分。
Method: Twenty cress seeds were placed on damp cotton wool in each of two identical trays. Tray A was placed on a windowsill that received direct sunlight for about six hours per day. Tray B was placed inside a cupboard where no light could enter. Both trays were given 20 cm³ of water each morning at 8:00 a.m. The height of ten randomly chosen seedlings from each tray was measured with a ruler every day for seven days, and the mean height was calculated.
方法：在两只相同托盘的潮湿脱脂棉上各放置 20 粒水芹种子。托盘 A 放在每天约有六小时阳光直射的窗台上。托盘 B 放在没有光线进入的橱柜里。每天早晨 8:00 给两只托盘浇 20 cm³ 水。连续七天，每天用直尺从每个托盘中随机选取 10 株幼苗测量高度，并计算平均高度。
| Day | Mean height of light‑grown seedlings (cm) | Mean height of dark‑grown seedlings (cm) |
|---|---|---|
| 1 | 0.5 | 0.4 |
| 3 | 1.8 | 2.1 |
| 5 | 3.2 | 3.5 |
| 7 | 4.6 | 5.9 |
Results: The dark‑grown seedlings were taller than the light‑grown seedlings from Day 3 onwards. By Day 7, the mean height of the dark‑grown seedlings was 5.9 cm, whereas the light‑grown seedlings had a mean height of only 4.6 cm.
结果：从第 3 天起，黑暗环境中生长的幼苗比光照下生长的幼苗更高。到第 7 天，暗生幼苗平均高度为 5.9 cm，而光生幼苗平均高度仅为 4.6 cm。
Discussion: The results did not support the original prediction. The dark‑grown seedlings grew taller because they were showing etiolation — a plant response to the lack of light where stems elongate rapidly in search of light. The light‑grown seedlings were stockier and greener, using energy for leaf development and photosynthesis. One possible improvement would be to measure the mass of the seedlings as well, because height alone does not show healthy growth. A limitation was that humidity inside the cupboard might have been different, which could have affected growth independently of light.
讨论：结果并未支持原来的预测。暗生幼苗长得更高是因为它们表现出了黄化现象——植物对缺光的一种反应，茎部快速伸长以寻找光照。光生幼苗则更粗壮、更绿，利用能量发展叶片并进行光合作用。一项可能的改进是同时测量幼苗质量，因为高度本身并不能表明生长是否健康。一个局限性是橱柜内的湿度可能不同，这可能会独立于光照而影响生长。
Conclusion: In conclusion, cress seedlings grown in the dark grew taller than those grown in the light over seven days. This shows that while light is needed for healthy green growth, the absence of light can cause faster stem elongation as the plant tries to reach light. The aim was met, but the hypothesis was disproved.
结论：总之，七天内暗处生长的水芹幼苗比光下生长的幼苗更高。这表明，尽管光照是植物健康生长的必要条件，但缺乏光照会导致茎更快地伸长，因为植物试图寻找光。目的已经达到，但假设被推翻了。
11. Final Checklist for Your Report | 报告终审清单
Before handing in your work, go through this checklist to make sure you have included everything required.
在提交作业前，对照这份清单，确保包含了所有要求的内容。
- Title – is it specific and does it include the variables? / 标题 – 是否具体？是否包含变量？
- Introduction – have I given scientific background and a clear aim? / 引言 – 是否提供了科学背景和明确目的？
- Method – could someone else repeat my experiment just by reading it? / 方法 – 他人仅凭阅读能重复我的实验吗？
- Results – are my tables and graphs labelled correctly with units? / 结果 – 表格和图表是否正确标注了单位？
- Discussion – have I explained my results using science and evaluated the method? / 讨论 – 是否用科学原理解释了结果并评价了方法？
- Conclusion – does it answer the aim without adding new ideas? / 结论 – 是否回答了目的，没有添加新想法？
Using this framework regularly will help you build a strong foundation for writing in biology all the way to GCSE and beyond. Practice writing short reports on every experiment you do, and soon the structure will feel natural.
经常使用这个框架，将帮助你打下坚实的生物学写作基础，直到 GCSE 甚至更远。每次做完实验都练习写一份简短报告，很快这个结构就会变得自然。
Published by TutorHao | Biology Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导Cancel reply