📚 Year 7 WJEC Science: In-Depth Analysis of Past Papers | Year 7 WJEC 科学：历年真题深度解析
Past papers are one of the most effective revision tools for Year 7 WJEC Science. They reveal the style of questions, key topics, and the level of detail required in answers. This in-depth analysis will walk you through typical exam questions, highlight common pitfalls, and show you how to maximise your marks.
历年真题是 Year 7 WJEC 科学最有效的复习工具之一。它们能揭示题型风格、重点主题以及答案所需的详细程度。本深度解析将带你梳理典型考题，指出常见失分点，并展示如何获取最高分。
1. Understanding Command Words | 理解指令词
WJEC exam questions often use specific command words. For example, 'describe' means say what you see or what happens, while 'explain' requires giving a scientific reason. Many marks are lost when learners simply describe instead of explaining.
WJEC 试题经常使用特定的指令词。例如，"describe" 意思是说出你观察到的或发生了什么，而 "explain" 则需要给出科学原因。很多同学因为只描述而没有解释而丢分。
Consider a past paper question: 'Describe how the particles are arranged in a solid.' A correct answer would state: Particles are tightly packed in a regular pattern and vibrate in fixed positions. Do not just write 'they are close together' – be precise.
来看一道真题："描述固体中微粒的排列方式。" 正确的答案应该是：微粒紧密排列成规则的图案，并在固定位置振动。不要只写"它们挨得很近"—要精准。
'Compare' questions ask for similarities and differences; use linking words like 'both' and 'whereas'. For instance, 'Compare an animal cell with a plant cell.' You need to mention both have a nucleus, but only the plant cell has a cell wall and chloroplasts.
"Compare" 类题目要求写出相同点和不同点；使用 "both" 和 "whereas" 等连接词。例如："比较动物细胞和植物细胞。" 你需要提到两者都有细胞核，但只有植物细胞具有细胞壁和叶绿体。
2. Biology: Cells and Microscopy | 生物：细胞与显微镜
A typical WJEC question asks you to label a diagram of an animal or plant cell. You must know the functions of the nucleus, cytoplasm, cell membrane, mitochondria, cell wall, chloroplasts and permanent vacuole. A common twist is to label structures with letters (A, B, C) and then ask for the names or functions.
典型的 WJEC 题目会要求你标注动物或植物细胞图。你必须知道细胞核、细胞质、细胞膜、线粒体、细胞壁、叶绿体和永久液泡的功能。常见的变形是用字母（A, B, C）标出结构，然后让你写出名称或功能。
| Feature | Animal Cell | Plant Cell |
|---|---|---|
| Cell Wall | Absent | Present (cellulose) |
| Chloroplasts | Absent | Present (photosynthesis) |
| Vacuole | Small/temporary | Large, permanent |
| Shape | Irregular | Regular (often rectangular) |
A popular multiple-choice question: 'Which structure is found in a plant cell but not in an animal cell?' The answer is chloroplast or cell wall. Always read carefully – some questions ask for 'not a function of...'.
一道常见的选择题："下列哪种结构存在于植物细胞而动物细胞没有？" 答案是叶绿体或细胞壁。一定要仔细读题——有些题目会问"哪一项不是……的功能"。
Microscopy questions frequently test total magnification. You might be asked: ' ion if the eyepiece lens magnification is ×10 and the objective lens magnification is ×40.' Answer: 400, and you must show the working.
显微镜题目经常考查总放大倍数。你可能会被问到："如果目镜放大倍数为 10×，物镜放大倍数为 40×，计算总放大倍数。" 答案：400，且必须展示计算过程。
Total magnification = Eyepiece lens magnification × Objective lens magnification
总放大倍数 = 目镜放大倍数 × 物镜放大倍数
When interpreting a scale bar, measure the bar with a ruler, then divide the real length by the number of micrometres or millimetres shown. Units are essential; forgetting to include 'μm' or 'mm' will lose a mark.
解读比例尺时，先用直尺测量比例尺长度，再用真实长度除以显示的微米或毫米数。单位至关重要；忘记写 "μm" 或 "mm" 会丢分。
3. Biology: Body Systems and Reproduction | 生物：身体系统与生殖
Questions on the skeleton may ask you to label bones like femur, ribs, skull, or to explain the functions: support, protection, movement, making blood cells. A past paper question: 'Explain how the ribcage protects the lungs and heart.' Answer: The ribcage forms a hard cage around the organs, preventing damage from impacts.
关于骨骼的题目可能会让你标注股骨、肋骨、头骨等，或解释其功能：支撑、保护、运动、造血。一道真题："解释肋骨如何保护肺和心脏。" 答案：肋骨形成一个坚固的笼状结构包围器官，防止撞击造成的损伤。
Digestive system questions often include a table of enzyme actions or a diagram showing the journey of food. Remember to state that the small intestine absorbs nutrients into the blood using villi, which provide a large surface area, thin walls, and a rich blood supply.
消化系统题目常包含酶作用的表格或食物行经示意图。记得要说明小肠通过绒毛将营养物质吸收进入血液，绒毛提供了巨大的表面积、薄壁和丰富的血液供应。
For plant reproduction, you need to label parts of a flower (stamen, carpel, petal, sepal) and describe pollination and fertilisation. A typical question: 'Explain the difference between insect-pollinated and wind-pollinated flowers.' Use features like large, brightly coloured petals vs. small, dull petals; sticky pollen vs. light, smooth pollen.
对于植物生殖，你需要标注花的各部分（雄蕊、雌蕊、花瓣、花萼）并描述传粉和受精。典型的题目："解释虫媒花和风媒花的区别。" 使用特征对比：大而鲜艳的花瓣与小而暗淡的花瓣；有粘性的花粉与轻而光滑的花粉。
4. Chemistry: Particle Model and States of Matter | 化学：微粒模型与物质状态
Questions on the particle model require accurate scientific vocabulary. A 3-mark question might ask: 'Describe the arrangement and movement of particles in a liquid.' The answer should include: particles are close together but arranged irregularly, and they can slide past each other. Avoid vague words like 'loose' or 'moving'.
微粒模型题目需要准确使用科学词汇。一道3分题可能会问："描述液体中微粒的排列和运动。" 答案应包含：微粒紧密但排列不规则，它们可以相互滑动。避免使用"松散"或"移动"等模糊词汇。
Drawing particles correctly is often tested. In a solid, draw circles touching in a regular pattern; in a gas, circles far apart with random arrows to show movement. Never draw particles as squares or use shading – it wastes time and looks unscientific.
正确画出微粒图也是常考内容。固体中，画相切的圆并呈规则排列；气体中，圆圈距离远，用随机箭头表示运动。千万不要把微粒画成方块或涂阴影——这不仅浪费时间，而且显得不科学。
Heating curve graphs appear regularly. A question may show a temperature–time graph of melting ice, and ask: 'Explain why the temperature stays constant between points B and C.' You must state that energy is being used to overcome the forces between particles, not to raise the temperature.
加热曲线图经常出现。一道题可能展示冰融化的温度-时间图，并问："解释为什么在 B 点与 C 点之间温度保持恒定。" 你必须说明能量用于克服微粒间的作用力，而不是升高温度。
5. Chemistry: Elements, Compounds and Mixtures | 化学：元素、化合物与混合物
A classic WJEC question shows three particle diagrams and asks you to identify which represents an element, a compound and a mixture. Remember: an element has only one type of atom; a compound has two or more types of atom chemically bonded together; a mixture has different substances not chemically joined.
经典的 WJEC 题目会给出三幅微粒示意图，要求你分辨哪一幅表示元素、化合物和混合物。记住：元素只含一种原子；化合物含有两种或两种以上不同原子并通过化学键结合；混合物含有不同物质且未通过化学键结合。
When writing chemical symbols, note the difference between CO (carbon monoxide) and Co (cobalt). The first letter is always a capital, the second lowercase. Common errors include writing 'CL' for chlorine instead of Cl, or 'NA' for sodium instead of Na.
书写元素符号时，注意 CO（一氧化碳）和 Co（钴）的区别。第一个字母始终大写，第二个小写。常见的错误包括把氯写成 "CL" 而不是 Cl，把钠写成 "NA" 而不是 Na。
Separation techniques are frequently examined. 'Explain how you could separate a mixture of sand, salt and water.' You would filter to remove sand (residue on filter paper), then evaporate the water from the filtrate to obtain salt crystals. Always use the correct terms: filtrate, residue, evaporation, distillation.
分离方法经常被考查。"解释如何分离沙、盐和水的混合物。" 你需要先过滤除去沙（滤纸上的残渣），然后从滤液中蒸发水分得到盐晶体。始终使用正确的术语：滤液、残渣、蒸发、蒸馏。
6. Chemistry: Acids and Alkalis | 化学：酸与碱
pH scale questions usually ask you to state the colour of universal indicator in a given substance. For example: 'A student adds universal indicator to lemon juice. State the colour and approximate pH.' Answer: red/orange, pH 1–3. Common mistake: confusing red with purple (alkali) or green (neutral).
pH 值题通常让你说出通用指示剂在特定物质中的颜色。例如："一名学生向柠檬汁中加入通用指示剂，请说出颜色和近似 pH 值。" 答案：红色/橙色，pH 1–3。常见错误：将红色与紫色（碱性）或绿色（中性）混淆。
Neutralisation word equations appear on nearly every paper: 'Write the word equation for the reaction between hydrochloric acid and sodium hydroxide.' wer is: hydrochloric acid + sodium hydroxide → sodium chloride + water. Always include the '+' and arrow.
中和反应的文字方程式几乎出现在每份试卷中："写出盐酸与氢氧化钠反应的文字方程式。" 正确答案是：盐酸 + 氢氧化钠 → 氯化钠 + 水。一定要包含 "+" 号和箭头。
r water. Using incorrect subscripts like H2O (without subscript) will be penalised in some marking schemes.
如果要求书写配平的符号方程式，要使用正确的化学式：HCl + NaOH → NaCl + H₂O。注意水的下标 ₂。使用错误的下标，如 H2O（无下标），在某些评分标准中会被扣分。
7. Physics: Forces and Motion | 物理：力与运动
Forces are measured in newtons (N), and WJEC often includes a practical scenario with a newtonmeter. A common question: 'Explain why a swimmer pushes backwards against the water to move forwards.' You need to refer to Newton's Third Law – action and reaction forces are equal and opposite.
力的单位是牛顿（N），WJEC 经常包含使用弹簧测力计的实践情境。常见问题："解释为什么游泳者向后推水却能向前移动。" 你需要提到牛顿第三定律——作用力与反作用力大小相等、方向相反。
Distance–time graphs are a core skill. If the line is straight and sloping upwards, the object is moving at a constant speed. A horizontal line means the object is stationary. Be prepared to calculate speed from the gradient: 'Calculate the speed between 0 and 10 seconds.'
距离-时间图是核心技能。如果线条是向上倾斜的直线，表示物体在匀速运动；水平线表示物体静止。准备好从斜率计算速度："计算 0 到 10 秒之间的速度。"
speed = distance ÷ time
速度 = 距离 ÷ 时间
alculation is 150 ÷ 30 = 5 m/s. Always include the unit m/s or leave a blank if you forget – but your answer is incomplete without it.
必须展示计算过程。如果汽车在 30 秒内行驶 150 米，计算为 150 ÷ 30 = 5 m/s。要始终带上单位 m/s，如果忘记也要留空——但缺少单位的答案是不完整的。
8. Physics: Energy Transfers and Stores | 物理：能量转移与储存
l potential, elastic potential, thermal, chemical and nuclear. An exam question might say: 'Describe the energy transfers when a ball is thrown upwards.' ional potential energy at its highest point. Some energy is always transferred to the surroundings as heat.
能量储存包括动能、重力势能、弹性势能、热能、化学能和核能。一道考题可能会说："描述向上抛球过程中的能量转移。" 答案：肌肉中的化学能→球的动能→最高点的重力势能。总有一部分能量以热的形式散失到环境中。
Sankey diagrams are a favourite. You may be asked to draw one or to complete a partially drawn diagram. Ensure the width of the arrows represents the amount of energy; useful energy outputs go straight, wasted energy branches downwards. Remember, the total input width equals the sum of output widths.
Sankey 图是常考题型。你可能会被要求画出或补全部分绘制的图表。确保箭头的宽度代表能量的大小；有用的能量输出指向右方，浪费的能量向下分支。记住，输入端的宽度总和等于输出端宽度之和。
9. Physics: Electricity and Circuits | 物理：电与电路
Drawing and interpreting circuit symbols is a basic requirement. Know the symbols for a cell, battery, bulb, switch (open and closed), ammeter, voltmeter and resistor. A common task: 'Draw a series circuit containing two bulbs and a switch.' Make sure your lines are straight and the circuit is complete.
绘制和解读电路符号是基本要求。要认识电池、蓄电池组、灯泡、开关（断开和闭合）、安培计、伏特计和电阻器的符号。常见任务是："画一个包含两个灯泡和一个开关的串联电路。" 确保线条平直且电路完整。
Fairly predictable is a question on adding more bulbs in series: 'Explain why all bulbs become dimmer when a third bulb is added in series.' es. Use the relationship: current = voltage ÷ resistance. Less current means dimmer bulbs.
增加串联灯泡的题目几乎必考："解释为什么串联第三个灯泡后，所有灯泡都变暗了。" 答案必须包含总电阻增加，因此电流减小。使用关系：电流 = 电压 ÷ 电阻。电流减小意味着灯泡变暗。
In parallel circuits, each bulb gets the full voltage, so brightness remains the same. A comparison question might demand you to state that if one bulb blows in a series circuit, all go out; in a parallel circuit, the others stay on.
在并联电路中，每个灯泡获得全部电压，因此亮度不变。对比类题目可能要求你说出：串联电路中，如果一个灯泡烧坏，全部熄灭；而并联电路中，其他灯泡仍然亮着。
10. Experimental Skills and Graphs | 实验技能与图表
Planning an investigation is a high-mark question. You must identify the independent variable (the one you change), dependent variable (the one you measure), and control variables (those kept the same). Example: 'Investigating how the length of a wire affects its resistance.' Independent: length of wire. Dependent: resistance (or current). Controls: temperature, thickness of wire, material.
设计实验是高分值题目。你必须确定自变量（你改变的）、因变量（你测量的）和控制变量（保持不变的）。例如："研究导线长度如何影响其电阻。" 自变量：导线长度。因变量：电阻（或电流）。控制变量：温度、导线粗细、材料。
When plotting a graph,
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