Year 10 WJEC Biology: Essay Writing Framework and Model Answer | 10年级 WJEC 生物：论文写作框架与范文

📚 Year 10 WJEC Biology: Essay Writing Framework and Model Answer | 10年级 WJEC 生物：论文写作框架与范文

In Year 10 WJEC Biology, you are often asked to write extended responses or full scientific reports. A clear essay-writing framework helps you structure your ideas logically and meet the mark scheme requirements. This article provides a step-by-step guide to writing a high-quality scientific report, using an investigation into enzyme activity as a model answer. Follow the PEEL (Point, Evidence, Explain, Link) principle and the IMRaD-inspired format to create a well-organised piece of work.

在 10 年级 WJEC 生物课程中，你经常需要撰写拓展性回答或完整的科学报告。一个清晰的论文写作框架可以帮助你有逻辑地组织想法并满足评分标准。本文将以一个关于酶活性的探究实验为例，逐步指导你如何撰写一份高质量的科学报告。请遵循 PEEL（观点、证据、解释、联系）原则和类似 IMRaD（简介、方法、结果和讨论）的格式，创作出结构严谨的作品。

1. Understanding the Scientific Report Structure | 理解科学报告结构

A typical scientific report in WJEC Biology follows a clear sequence: Title, Introduction (with background and hypothesis), Variables, Apparatus, Method, Results, Analysis, Conclusion, and Evaluation. This structure helps readers follow your scientific thinking from question to answer.

WJEC 生物学科中一份典型的科学报告遵循清晰的顺序：标题、引言（包含背景和假设）、变量、仪器、方法、结果、分析、结论和评价。这种结构有助于读者跟随你的科学思维从问题走向答案。

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2. Crafting a Clear Title | 拟定清晰标题

The title should be specific and mention the independent variable (what you change) and the dependent variable (what you measure). Use a statement format, for example: 'Investigating the effect of temperature on the activity of catalase enzyme.'

标题应该具体，并且提及自变量（你改变的量）和因变量（你测量的量）。使用陈述句式，例如：“探究温度对过氧化氢酶活性的影响”。

Our model title in English: Investigating the effect of temperature on the activity of catalase.

英文示范标题：Investigating the effect of temperature on the activity of catalase.

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3. Writing the Introduction & Background | 撰写引言与背景

Begin with relevant scientific theory. Explain what catalase is and why it is important. Mention the reaction it catalyses: the breakdown of hydrogen peroxide into water and oxygen. Include the key concept of enzyme activity being affected by temperature due to collision frequency and denaturation.

从相关的科学理论开始。解释什么是过氧化氢酶及其重要性。提及它催化的反应：将过氧化氢分解成水和氧气。引入关键概念：温度通过影响碰撞频率和变性过程来影响酶活性。

oxide (H₂O₂) into water (H₂O) and oxygen (O₂). The equation is: 2H₂O₂ → 2H₂O + O₂. Enzymes are proteins, and their three-dimensional shape is essential for function. Temperature changes can increase molecular collisions but also permanently damage the active site above a certain point.

中文引言示范：过氧化氢酶是一种存在于许多活细胞（如马铃薯组织）中的酶。它能加速过氧化氢（H₂O₂）分解为水（H₂O）和氧气（O₂）。方程式为：2H₂O₂ → 2H₂O + O₂。酶是蛋白质，其三维形状对功能至关重要。温度变化可以增加分子碰撞，但超过一定温度后会永久破坏活性位点。

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4. Formulating a Hypothesis | 提出假设

A strong hypothesis predicts the relationship between variables and gives a scientific reason. Use 'If... then... because...' structure.

一个有力的假设要预测变量之间的关系并给出科学理由。使用“如果……那么……因为……”的结构。

Model hypothesis in English: If the temperature of the hydrogen peroxide solution increases, then the rate of reaction catalysed by catalase will increase up to an optimum around 40°C, after which the rate will decrease, because higher temperatures initially provide more kinetic energy for more frequent enzyme–substrate collisions, but beyond the optimum the enzyme denatures and the active site loses its specific shape.

中文假设示范：如果过氧化氢溶液的温度升高，那么过氧化氢酶催化的反应速率会上升，直到约 40°C 的最适温度，之后速率将下降，因为较高的温度最初提供更多动能，使酶与底物碰撞更频繁，但超过最适点后酶变性，活性位点失去特定形状。

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5. Identifying Variables | 明确变量

Clearly list the independent, dependent, and at least three control variables in a table or bullet points. Proper variable identification is a common mark-scheme target in WJEC practical questions.

在表格或项目符号中清楚地列出自变量、因变量以及至少三个控制变量。正确识别变量是 WJEC 实验题常考的评分点。

Variable type	Variable	How it is controlled or changed
Independent	Temperature of H₂O₂ solution	Use water baths set at 10, 20, 30, 40, 50, 60°C
Dependent	Time for a filter paper disk soaked in catalase to rise to the surface (s)	Measure with stopwatch; calculate rate as 1/time
Control 1	Volume of H₂O₂ solution	Always use 20 cm³ in each test tube
Control 2	Concentration of H₂O₂	Use the same 3% solution throughout
Control 3	Size and type of potato disk	Use a cork borer to cut identical 6 mm diameter disks, each soaked in the same catalase extract for 30 seconds

中文变量表：

变量类型	变量	如何控制或改变
自变量	H₂O₂溶液的温度	使用设置在 10°C、20°C、30°C、40°C、50°C、60°C 的水浴
因变量	浸泡过氧化氢酶的滤纸碟上浮至液面所需的时间（秒）	用秒表测量；以 1/时间 计算速率
控制变量1	H₂O₂溶液体积	每支试管始终使用 20 cm³
控制变量2	H₂O₂浓度	全程使用同一 3% 溶液
控制变量3	土豆碟的大小和类型	用打孔器切取相同的直径 6 mm 圆片，每个在相同过氧化氢酶提取液中浸泡 30 秒

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6. Listing Apparatus and Materials | 列出仪器与材料

List all equipment needed, with sizes and quantities where relevant. Use a bulleted list for clarity.

列出所有需要的设备，注明规格和数量。使用项目符号清单以保证清晰。

• 6 test tubes and a test tube rack
• Water baths at 10°C, 20°C, 30°C, 40°C, 50°C, 60°C
• Thermometer (±0.5°C)
• Stopwatch (±0.01 s)
• 20 cm³ of 3% hydrogen peroxide solution per trial
• Potato catalase solution (liquidised potato blended with 100 ml distilled water and filtered through muslin)
• Filter paper disks (6 mm diameter, Whatman No. 1)
• Forceps
• 50 cm³ measuring cylinder
• Cork borer
• Scalpel and white tile
• Safety goggles and lab coat

中文仪器清单：

• 6 支试管和试管架
• 设置为 10°C、20°C、30°C、40°C、50°C、60°C 的水浴
• 温度计（±0.5°C）
• 秒表（±0.01 秒）
• 每次试验 20 cm³ 3% 过氧化氢溶液
• 马铃薯过氧化氢酶溶液（马铃薯加 100 ml 蒸馏水搅碎，经纱布过滤）
• 滤纸圆片（直径 6 mm，Whatman 1 号）
• 镊子
• 50 cm³ 量筒
• 打孔器
• 解剖刀与白瓷板
• 护目镜和实验服

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7. Describing the Method Step by Step | 逐步描述方法

Write the method in clear, numbered steps using imperative verbs. Another person should be able to replicate your experiment exactly. Include any safety precautions and repeats.

用带编号的步骤和祈使动词清晰描述方法。另一个人应能完全复制你的实验。要包含安全注意事项和重复实验。

English method:

英文方法：

1. Label six test tubes 10°C, 20°C, 30°C, 40°C, 50°C, 60°C and place them in the corresponding water baths for 5 minutes to equilibrate.
2. Use a measuring cylinder to pour 20 cm³ of 3% hydrogen peroxide into each test tube. Allow the solutions to reach the target temperature (check with thermometer).
3. Cut 36 filter paper disks using a hole punch. Soak exactly 6 disks in the catalase solution for 30 seconds each.
4. Using forceps, carefully place one disk at the bottom of the first test tube (10°C) and immediately start the stopwatch.
5. Watch the disk; as oxygen bubbles accumulate, it will float to the surface. Stop the stopwatch the moment the disk reaches the top. Record the time.
6. Repeat step 5 for two more disks at the same temperature to obtain three readings.
7. Empty the test tube, rinse, and repeat steps 2–6 for the remaining temperatures.
8. Calculate rate of reaction as 1 ÷ mean time (s⁻¹) for each temperature.
9. Wear safety goggles at all times; hydrogen peroxide is an irritant. Dispose of solutions as directed by your teacher.

中文方法：

1. 将 6 支试管分别标记为 10°C、20°C、30°C、40°C、50°C、60°C，放入对应水浴中平衡 5 分钟。
2. 用量筒向每支试管倒入 20 cm³ 3% 过氧化氢溶液。待溶液达到目标温度（用温度计检查）。
3. 用打孔器切出 36 片滤纸圆片。每次取 6 片在过氧化氢酶溶液中浸泡 30 秒。
4. 用镊子小心地将一片圆片放入第一支试管（10°C）底部，同时启动秒表。
5. 观察圆片；随着氧气泡聚集，它会浮向液面。在圆片抵达液面瞬间停止秒表，记录时间。
6. 在同一温度下用另外两片滤纸重复步骤 5，获得三个读数。
7. 清空并清洗试管，对其余温度重复步骤 2–6。
8. 计算各温度下的反应速率：速率 = 1 ÷ 平均时间（s⁻¹）。
9. 全程佩戴护目镜；过氧化氢有刺激性。按老师指示处置废液。

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8. Presenting Results Effectively | 有效呈现结果

Present raw data in a ruled table with clear headings and units. Calculated values such as rate should also be included. Draw a line graph of temperature (x‑axis, continuous) against rate of reaction (y‑axis).

将原始数据展示在带有清晰标题和单位的表格中。计算值（如速率）也应包含在内。绘制温度（x 轴，连续变量）对反应速率的折线图。

Temperature (°C)	Time Trial 1 (s)	Time Trial 2 (s)	Time Trial 3 (s)	Mean Time (s)	Rate (1/s) (s⁻¹)
10	125	118	117	120	0.008
20	62	59	59	60	0.017
30	32	30	28	30	0.033
40	19	21	20	20	0.050
50	48	45	42	45	0.022
60	105	98	97	100	0.010

中文结果表：

温度 (°C)	时间 试验1 (s)	时间 试验2 (s)	时间 试验3 (s)	平均时间 (s)	速率 (1/s) (s⁻¹)
10	125	118	117	120	0.008
20	62	59	59	60	0.017
30	32	30	28	30	0.033
40	19	21	20	20	0.050
50	48	45	42	45	0.022
60	105	98	97	100	0.010

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9. Analysing Data and Identifying Trends | 分析数据并识别趋势

Describe the pattern clearly using data from the table. Mention the peak rate and the temperature at which it occurs. Link the trend to enzyme behaviour.

使用表中的数据清晰描述规律。提及最高速率及其对应的温度。将趋势与酶的行为联系起来。

English analysis: The results show that as temperature increased from 10°C to 40°C, the rate of reaction rose steadily, from 0.008 s⁻¹ to a maximum of 0.050 s⁻¹. This is because the enzyme and substrate molecules gained kinetic energy, leading to more frequent successful collisions. At 50°C, the rate dropped to 0.022 s⁻¹, and at 60°C it fell further to 0.010 s⁻¹, indicating that the enzyme had denatured. The bonds maintaining the active site’s shape were broken, so the substrate could no longer fit.

中文分析：结果显示，温度从 10°C 升高到 40°C 时，反应速率稳步上升，从 0.008 s⁻¹ 加快到最大值 0.050 s⁻¹。这是因为酶和底物分子获得了动能，导致有效碰撞更频繁。在 50°C 时速率降至 0.022 s⁻¹，60°C 时进一步降至 0.010 s⁻¹，表明酶已变性。维持活性位点形状的键被破坏，底物不再能契合。

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10. Drawing Valid Conclusions | 得出有效结论

The conclusion should state whether the hypothesis was supported, using specific data as evidence. Do not introduce new ideas.

结论应说明假设是否得到支持，并使用具体数据作为证据。不要引入新观点。

English conclusion: The hypothesis is supported. As predicted, the rate increased up to an optimum near 40°C (0.050 s⁻¹) and then declined as the enzyme denatured. The optimum temperature for potato catalase appears to be approximately 40°C. These results align with the scientific theory that enzyme activity increases with temperature until thermal denaturation occurs.

中文结论：假设得到了支持

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