📚 Year 7 SQA Biology: Essay Writing Framework and Model Essays | Year 7 SQA 生物：论文写作框架与范文
In Year 7 SQA Biology, essay writing is a key skill that lets you organise scientific knowledge and show how processes link together. This guide explains a step-by-step framework you can follow, and it includes three full model essays on core topics. You will learn to decode questions, plan answers, write clear paragraphs, and check your own work.
在 Year 7 SQA 生物中，论文写作是一项关键技能，能让你整理科学知识并展示过程之间的联系。本指南解释了一个你可以遵循的逐步框架，并包含了三篇关于核心主题的完整范文。你将学会解读题目、规划答案、写出清晰的段落以及自我检查。
1. Understanding the SQA Biology Essay Requirements | 理解 SQA 生物论文要求
SQA Biology essays at this level usually ask you to describe, explain or compare a biological process. You are expected to write a structured answer with an introduction, body paragraphs and a conclusion. The response should be concise but still rich in scientific detail, using correct terminology and logical order.
SQA 生物论文在这个层次通常要求你描述、解释或比较一个生物学过程。你需要写出结构化的答案，包括引言、主体段落和结论。回答应当简洁，但科学细节要丰富，使用正确的术语并按逻辑顺序展开。
Marks are awarded for knowledge, accuracy and the ability to link ideas. A clear framework therefore gives you a strong template for success.
分数是根据知识、准确性以及联系观点的能力来评定的。因此，一个清晰的框架为你提供了取得好成绩的有力模板。
2. Decoding the Essay Question | 解读论文题目
Start by circling the command word. ‘Describe’ wants a step‑by‑step account; ‘explain’ asks for reasons and mechanisms; ‘compare’ needs similarities and differences. Underline the key biological terms — words like ‘photosynthesis’, ‘diffusion’ or ‘adaptation’ — because they tell you exactly what to focus on.
首先要圈出指令词。“描述”要求逐步陈述；“解释”需要给出原因和机制；“比较”则需要指出异同。在关键生物学术语下划线——如“光合作用”、“扩散”或“适应”——因为它们确切告诉你该聚焦什么。
Rewrite the question in your own words to check that you really understand it. This simple step helps you avoid going off‑topic.
用自己的话把问题复述一遍，以检查自己是否真正理解了它。这个简单的步骤有助于防止离题。
3. Planning and Organising Your Ideas | 规划与组织想法
Spend five minutes building a quick plan. Jot down facts, keywords and examples in a mind map or bullet‑point list. Then group related points together — each group will become one body paragraph.
花五分钟快速构建一个计划。在思维导图或要点列表中记下事实、关键词和例子。然后将相关的点归为一组——每一组将成为一个主体段落。
ch → small intestine → large intestine. This logical flow keeps your essay easy to follow.
一个好的计划还会显示你的论述顺序。例如，如果你在解释消化过程，你可能会列出：口腔 → 食道 → 胃 → 小肠 → 大肠。这种逻辑流程让你的论文易于理解。
4. Structuring the Introduction | 构建引言结构
Your introduction should do two things: state the topic and outline the structure. A strong opening sentence tells the reader exactly which process you will discuss, for example: ‘This essay describes how plants make food through photosynthesis and explains the role of light and chlorophyll.’
你的引言应该做到两件事：说明主题并概述结构。一个有力的开头句告诉读者你将讨论的具体过程，例如：“本文将描述植物如何通过光合作用制造食物，并解释光和叶绿素的作用。”
Keep the introduction short — two or three sentences are enough. You are setting the scene, not telling the whole story yet.
引言要简短——两三个句子就足够了。你是在铺设背景，而不是马上讲述整个故事。
5. Building Body Paragraphs with Scientific Evidence | 用科学证据构建主体段落
Each body paragraph should start with a topic sentence that introduces the main idea. Then provide specific scientific details. For a paragraph on the role of chlorophyll, you might write: ‘Chlorophyll absorbs sunlight energy. This energy is used to split water molecules into hydrogen and oxygen.’
每个主体段落应以介绍主要观点的主题句开头。然后提供具体的科学细节。对于有关叶绿素作用的段落，你可以写：“叶绿素吸收太阳光能。这些能量用于将水分子分解成氢和氧。”
Support your explanation with real examples, such as showing the chemical equation for photosynthesis. End the paragraph by linking back to the question — this shows the marker you are fully addressing the task.
用真实例子支持你的解释，比如写出光合作用的化学方程式。段落结尾可以再次回扣问题——这向阅卷人表明你完全在回应任务。
6. Using Scientific Vocabulary and Diagrams | 使用科学词汇与图表
Accurate vocabulary is essential. Use terms like ‘chloroplast’, ‘mitochondria’, ‘villi’ and ‘diffusion’ correctly. This demonstrates confidence and earns marks.
准确的词汇至关重要。正确使用“叶绿体”、“线粒体”、“绒毛”和“扩散”等术语。这体现了你的自信并能获得分数。
You may also sketch and label a simple diagram to support your writing. Always refer to the diagram in your text — for example, ‘As shown in Figure 1, the villi increase surface area for absorption.’ Keep your drawings neat and labels horizontal.
你还可以绘制并标注一个简单的图表来辅助写作。务必在文章中提及该图表——例如，“如图1所示，绒毛增加了吸收的表面积。”绘图要整洁，标注保持水平。
7. Crafting a Strong Conclusion | 撰写有力的结论
The conclusion summarises the main points without introducing new facts. It often restates the importance of the biological process. A good conclusion for a photosynthesis essay could be: ‘In summary, photosynthesis converts light energy into chemical energy, provides glucose for plants, and releases oxygen essential for animal life.’
结论总结主要观点而不引入新信息。它通常会重申该生物学过程的重要性。光合作用论文的一个好结论可以是：“总之，光合作用将光能转化为化学能，为植物提供葡萄糖，并释放出对动物生命至关重要的氧气。”
Keep it brief and confident. A clear ending leaves a positive final impression on the marker.
保持简洁而自信。一个清晰的结尾会给阅卷人留下积极的最终印象。
8. Sample Essay 1: How Plants Make Food (Photosynthesis) | 范文1：植物如何制造食物（光合作用）
Essay question: Describe the process of photosynthesis and explain why it is essential for life on Earth.
论文题目：描述光合作用的过程，并解释它为何对地球上的生命至关重要。
Photosynthesis is the chemical process green plants use to make their own food. It takes place inside chloroplasts, which are tiny structures located in plant cells. Chloroplasts contain a green pigment called chlorophyll that captures energy from sunlight.
光合作用是绿色植物用来制造自身食物的化学过程。它发生在叶绿体内部，叶绿体是位于植物细胞中的微小结构。叶绿体含有一种叫做叶绿素的绿色色素，它捕获来自太阳光的能量。
ynthesis is: Carbon dioxide + Water → Glucose + Oxygen. The balanced chemical equation is: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
所需的原料是来自大气的二氧化碳和根部从土壤中吸收的水。光合作用的文字方程式为：二氧化碳 + 水 → 葡萄糖 + 氧气。平衡化学方程式为：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。
During the light‑dependent stage, sunlight energy splits water molecules into hydrogen and oxygen. The oxygen gas escapes through the stomata as a by‑product. In the next stage, hydrogen combines with carbon dioxide to produce glucose, a simple sugar that stores chemical energy.
在光反应阶段，太阳光能将水分子分解成氢和氧。氧气作为副产品通过气孔逸出。在下一个阶段，氢与二氧化碳结合生成葡萄糖，这是一种储存化学能的单糖。
Some glucose is used immediately in respiration to release energy for growth and repair. The rest is converted into starch and stored in roots, stems and leaves. Photosynthesis is essential because it produces oxygen for animals to breathe and forms the basis of nearly all food chains.
一些葡萄糖立即用于呼吸作用，释放能量以促进生长和修复。其余的则转化为淀粉储存在根、茎和叶中。光合作用至关重要，因为它为动物呼吸产生氧气，并构成了几乎一切食物链的基础。
9. Sample Essay 2: The Journey of Food (Digestion) | 范文2：食物的旅程（消化）
Essay question: Describe the journey of a sandwich through the digestive system and explain how nutrients are absorbed.
论文题目：描述一个三明治经过消化系统的旅程，并解释营养物质如何被吸收。
Digestion begins in the mouth, where teeth mechanically crush the sandwich into smaller pieces. Saliva, which contains the enzyme amylase, mixes with the food and starts breaking down starch into maltose — this is chemical digestion.
消化从口腔开始，牙齿机械地将三明治嚼碎成小块。含有淀粉酶的唾液与食物混合，开始将淀粉分解为麦芽糖——这是化学消化。
The chewed food, now called a bolus, travels down the oesophagus by muscular contractions known as peristalsis. It reaches the stomach, where gastric juice containing hydrochloric acid and protease enzymes breaks down proteins. The stomach churns the food into a thick liquid called chyme.
被咀嚼后的食物现在称为食团，通过称作蠕动的肌肉收缩沿食道向下移动。它到达胃部，含有盐酸和蛋白酶类的胃液在这里分解蛋白质。胃将食物搅拌成一种叫做食糜的稠状液体。
Chyme then enters the small intestine. Here, bile from the liver neutralises acid and emulsifies fats, while enzymes from the pancreas complete the digestion of fats, carbohydrates and proteins. The inner wall of the small intestine is covered with millions of tiny finger‑like villi, which greatly increase the surface area for absorption. Digested nutrients pass through the villi into the bloodstream.
食糜随后进入小肠。在这里，来自肝脏的胆汁中和胃酸并乳化脂肪，而来自胰腺的酶则完成对脂肪、碳水化合物和蛋白质的消化。小肠的内壁覆盖着数百万个微小的指状绒毛，大大增加了吸收的表面积。消化后的营养物质通过绒毛进入血液。
Undigested material moves into the large intestine, where water and minerals are reabsorbed. The remaining waste is stored in the rectum and later egested through the anus. This journey ensures the body receives amino acids, glucose and fatty acids for energy, growth and cell repair.
未消化的物质进入大肠，在这里水和矿物质被重新吸收。剩余的废物储存在直肠中，随后通过肛门排出。这一旅程确保身体获得氨基酸、葡萄糖和脂肪酸，用于能量供应、生长和细胞修复。
10. Sample Essay 3: Adaptations for Survival | 范文3：生存的适应
Essay question: Explain how a camel is adapted to survive in a hot desert.
论文题目：解释骆驼如何适应炎热的沙漠生存。
A camel has many specialised features that help it live in extremely hot and dry conditions. Its most famous adaptation is the hump, which stores fat rather than water. When food is scarce, the fat can be broken down to provide both energy and water through respiration.
骆驼有许多特化的特征，帮助它在极热和干燥的条件下生存。它最著名的适应特征是驼峰，其中储存的是脂肪而非水。当食物稀缺时，脂肪可通过呼吸作用分解，同时提供能量和水。
To protect against sandstorms, camels have long eyelashes and nostrils that can close tightly. Their wide, padded feet spread their weight and prevent them from sinking into loose sand. These structural adaptations minimise heat gain and keep the animal stable.
为了抵御沙尘暴，骆驼拥有长睫毛和能紧密闭合的鼻孔。它们宽大而有厚垫的脚分散了重量，防止陷入松软的沙子。这些结构适应减少了热量吸收并使动物保持稳定。
A camel’s body temperature can safely fluctuate between 34 °C and 41 °C, which reduces the need for sweating. They can also drink up to 46 litres of water in a single session without experiencing cell damage. These physiological adaptations enable camels to survive where most other large mammals could not.
骆驼的体温可以在 34 °C 到 41 °C 之间安全波动，这减少了出汗的需求。它们还能一次饮用多达 46 升水而不会造成细胞损伤。这些生理适应使骆驼能够生存于大多数其他大型哺乳动物无法生存的地方。
11. Peer Review and Editing Checklist | 同伴评审与编辑清单
After drafting your essay, swap with a partner and use a checklist to give constructive feedback. Look for a clear introduction, logical paragraph order, accurate science and a concluding sentence. Checking someone else’s work also sharpens your own editing skills.
写完草稿后，与同伴交换并使用一份清单来提供建设性反馈。检查是否有清晰的引言、合理的段落顺序、准确的科学内容以及总结句。检查他人的作品也能提高你自己的编辑能力。
