📚 Year 7 WJEC Science: Exam Answering Techniques and Marking Criteria | 七年级 WJEC 科学：答题技巧与评分标准
Success in Year 7 WJEC Science isn't just about knowing facts — it's about showing what you know in the way examiners expect. Understanding how marks are awarded and mastering answering techniques can make a real difference to your grade.
在七年级 WJEC 科学考试中取得好成绩，不仅在于掌握知识，更在于按照考官期望的方式展现所知。了解评分方式并掌握答题技巧，能让你的成绩真正不同。
1. Understanding Command Words | 理解指令词
Command words such as 'state', 'describe', 'explain', and 'calculate' tell you exactly what the examiner wants. If you misinterpret the command word, you may write a correct fact but still lose marks because the style of answer is wrong.
诸如 'state'、'describe'、'explain' 和 'calculate' 之类的指令词，准确告知了考官想要什么。如果你误解了指令词，可能写出的正确信息也会丢分，因为答题形式不对。
'State' means give a short, factual answer with no explanation. For example, "State one function of the nucleus." — "It controls the cell's activities."
'State' 意为给出简短的事实性答案，无需解释。例如：“State one function of the nucleus.”——"It controls the cell's activities."
'Describe' asks you to say what something is like, what you observe, or what happens during a process. You should include details, often in a logical order, but you do not need to give reasons. For instance, "Describe how you would test for starch." — "Add a few drops of iodine solution to the food sample. If starch is present, the iodine changes from brown to blue-black."
'Describe' 要求你说出某事物是什么样的、你观察到什么，或在某个过程中发生了什么。你需要包含细节，通常按逻辑顺序叙述，但无需说明原因。例如：“Describe how you would test for starch.”——"Add a few drops of iodine solution to the food sample. If starch is present, the iodine changes from brown to blue-black."
'Explain' is a common high-mark command word. It requires you to give reasons, say why something happens, or link ideas using scientific concepts. Use words like 'because', 'so', 'therefore', and 'this means that'. An explain question might be: "Explain why a plant needs glucose." — "Glucose is used in respiration to release energy for growth and other life processes."
'Explain' 是常见的高分值指令词。它要求你给出原因，解释某事为何发生，或用科学概念把想法串联起来。要用 'because'、'so'、'therefore' 和 'this means that' 等词。例如："Explain why a plant needs glucose."——"Glucose is used in respiration to release energy for growth and other life processes."
'Calculate' for correct substitution of values into a formula. Remember to include units. For example, "Calculate the speed of the car." — speed = distance ÷ time = 100 m ÷ 20 s = 5 m/s.
'Calculate' 意味着你必须进行数学运算并展示步骤。即使最终答案错误，正确代入数值也可能得分。别忘了写上单位。例如："Calculate the speed of the car."——speed = distance ÷ time = 100 m ÷ 20 s = 5 m/s.
2. Structuring Your Answers for 1–3 Mark Questions | 为 1–3 分题构建答案结构
Always check the number of marks in square brackets. The number of marks is a clue to how many separate points you should make and how much detail to include.
一定要看清方括号中的分值。分值提示了你应该写出几个独立的要点，以及需要包含多少细节。
For a 1-mark question, a single fact, a word or a short phrase is usually sufficient. If you write a long explanation, you might introduce a mistake that contradicts your correct answer.
对于 1 分题，通常只需一个事实、一个词或一个简短的短语。如果你写了一大段解释，反而可能引入错误，与你正确的答案产生矛盾。
For a 2-mark question, you should provide two distinct points or a point with a linked piece of evidence. For example, "Give two ways in which an animal cell differs from a plant cell." — "1. Animal cells do not have a cell wall. 2. Animal cells do not have chloroplasts."
对于 2 分题，你应给出两个不同的要点，或一个要点配上相关证据。例如："Give two ways in which an animal cell differs from a plant cell."——"1. Animal cells do not have a cell wall. 2. Animal cells do not have chloroplasts."
For 3-mark questions, you often need to make three separate points or a simple sequence. Use bullet points if the question allows it, or write clear sentences. The examiner marks positive points and usually ignores extra irrelevant material, but you must not contradict the science.
对于 3 分题，通常需要写出三个独立的要点或一个简单的过程顺序。如果题目允许，可以使用项目符号，或写清楚句子。考官给正确的点加分，无关的多余内容通常被忽略，但你不能写出与科学原理矛盾的内容。
3. Tackling 4–6 Mark Extended Response Questions | 处理 4–6 分扩展回答问题
These questions test deeper understanding and your ability to structure a coherent scientific explanation. WJEC examiners are looking for a logical flow of ideas.
这类问题考察更深层次的理解以及你构建连贯科学解释的能力。WJEC 考官看重有逻辑的思路展开。
A reliable method is P.E.E.: Point – Evidence – Explain. Start with a clear scientific point, support it with data or a specific example, then explain why it happens using scientific principles. For a 6-mark question comparing two ecosystems, you might say: "Point: A woodland has more biodiversity than a city park. Evidence: There are many more species of plants and animals recorded. Explain: This is because woodlands provide a greater variety of habitats and food sources."
一个可靠的方法是 P.E.E.：观点 – 证据 – 解释。先提出一个明确的科学观点，然后用数据或具体例子支撑，最后用科学原理解释为什么会这样。对于比较两个生态系统的 6 分题，你可以这样写：“观点：林地的生物多样性比城市公园更高。证据：记录了更多种类的动植物。解释：这是因为林地提供了更多样的栖息地和食物来源。”
Use connecting phrases: 'because', 'therefore', 'this leads to', 'as a result'. Avoid writing one or two huge sentences; break your answer into clear steps. Even if a long answer has a small error, marked points can still be credited provided they are correct and not contradicted.
使用连接短语：'because'、'therefore'、'this leads to'、'as a result'。避免写一两个巨大的长句；要把答案拆分成清晰的步骤。即使长回答中有个小错误，只要正确的得分点不与之矛盾，仍可获得相应分值。
Always refer back to any given data, diagram or graph. For example, if the question provides a table of plant growth under different lights, you must quote figures to support your comparison: "Under white light the plant grew 15 cm, which is 5 cm more than under red light."
一定要引用试题中给出的数据、图表或示意图。例如，如果题目给出一个表格，显示不同光照下植物的生长情况，你必须引用数字来支持比较：“在白光下植物生长了 15 cm，比红光下多了 5 cm。”
4. Using Scientific Terminology Correctly | 正确使用科学术语
Examiners expect you to use precise scientific vocabulary. Using everyday words instead of the correct term can lose marks, especially in higher-mark questions.
考官期望你使用精准的科学词汇。用日常用语代替正确的术语会丢分，特别是在高分值题目中。
Common examples: say 'dissolve' not 'disappear'; 'respire' not 'breathe' when talking about cellular processes; 'force' not 'push' when referring to an interaction that can change motion. Using these correctly shows you understand the concepts.
常见例子：要说 'dissolve' 而不是 'disappear'；在谈到细胞过程时用 'respire' 而不是 'breathe'；在指能改变运动的相互作用时用 'force' 而不是 'push'。正确使用这些术语表明你理解了概念。
In physics, 'mass' and 'weight' are often confused in Year 7. Mass is the amount of matter, measured in kilograms. Weight is a force caused by gravity, measured in newtons. If you state "The mass is 5 N," it is scientifically wrong and will not gain the mark.
在物理中，七年级常混淆 'mass' 和 'weight'。质量是物质的多少，以千克为单位；重量是由重力引起的力，以牛顿为单位。如果你写 "The mass is 5 N"，这在科学上是错误的，得不了分。
When writing about chemical changes, use 'reactant' and 'product', not 'starter' and 'ender'. If you describe the pH scale, use 'acidic', 'neutral', 'alkaline'. Precise language is always rewarded.
在写化学变化时，要用 'reactant' 和 'product'，而不是 'starter' 和 'ender'。描述 pH 标度时，要用 'acidic'、'neutral'、'alkaline'。精准的语言总会得到回报。
5. Interpreting Graphs, Tables and Diagrams | 解读图表和示意图
Many WJEC questions provide data in a visual form. You need to read axes labels, units, and keys before you start writing. Describing a trend is not enough if you don't quote data.
许多 WJEC 题目提供可视化数据。在动手写答案之前，一定要看清坐标轴标签、单位和图例。如果只描述趋势而不引用数据，那是不够的。
To describe a graph: first state the overall trend ("As temperature increases, the rate of reaction increases"), then quote specific values at the start and end of the graph. For a table, always compare the highest and lowest values. Use the correct units exactly as they appear.
描述图表时：先说明整体趋势（"As temperature increases, the rate of reaction increases"），再引用图表起点和终点的具体数值。对于表格，总是比较最大值和最小值。严格按图表中的单位使用单位。
If a question asks "Calculate the difference", you must subtract and state the unit. For example, "The difference in speed is 8 m/s – 5 m/s = 3 m/s." numerical answer without units unless the unit has already been given in the answer line.
如果题目要求 "Calculate the difference"，你必须做减法并写出单位。例如："The difference in speed is 8 m/s – 5 m/s = 3 m/s。" 永远不要在数字答案后漏掉单位，除非答题线上已经给出了单位。
Diagrams may show apparatus, cells or forces. Label parts clearly using the terms learned in class. If a diagram has a mirror surface, carefully draw the reflected ray with angle labelled. Interpret arrows and flowcharts step by step.
示意图可能展示仪器、细胞或力。用课堂上学到的术语清晰标注各部分。如果示意图有镜面，要认真画出反射光线并标注角度。对箭头和流程图一步一步进行解读。
6. Designing a Fair Test and Identifying Variables | 设计公平实验并识别变量
Investigation skills are heavily tested in Year 7 WJEC Science. You must be able to identify the independent variable (the thing you change), the dependent variable (the thing you measure), and control variables (things you keep the same).
实验探究技能在七年级 WJEC 科学中考察较多。你必须能识别自变量（你改变的事物）、因变量（你测量的事物）和控制变量（你保持不变的事物）。
A typical question: "A student investigates how temperature affects the rate of dissolving. Identify the independent variable." The answer is "temperature". The dependent variable could be "time taken for the solid to dissolve". A control variable could be "volume of water" or "mass of solid". Write exactly one variable per blank.
典型问题：“一名学生研究温度如何影响溶解速率。请指出自变量。”答案是“温度”。因变量可能是“固体完全溶解所需的时间”。一个控制变量可以是“水的体积”或“固体的质量”。每个空只准确填一个变量。
When describing a method, use numbered steps, and make sure you state how you will measure the dependent variable and how you will keep control variables constant. For example: "1. Measure 100 cm³ of water using a measuring cylinder. 2. Keep the mass of salt at 5 g for each trial. 3. Use a stopwatch to time how long it takes to dissolve."
在描述实验方法时，用编号步骤，并确保说明如何测量因变量，以及如何让控制变量保持恒定。例如：“1. 用量筒量取 100 cm³ 的水。2. 每次试验保持盐的质量为 5 g。3. 用秒表记录溶解所需的时间。”
WJEC often awards marks for recognising how to make results reliable — repeating readings and calculating a mean, and identifying anomalies. Mention these in your answer if the question asks for improvements.
WJEC 通常会对识别如何让结果可靠的做法给分——比如重复读数并计算平均值，以及识别异常值。如果题目要求提出改进，要在答案中提到这些。
7. Common Mistakes and How to Avoid Them | 常见错误及避免方法
One of the biggest mistakes is not reading the question fully. Students often answer what they expect to see, not what the question actually asks. Underline key words and command words before you start writing.
最大的错误之一是没把题目读完整。学生常常按自己期望看到的作答，而非根据题目实际要求。动笔前，画出关键词和指令词。
Missing units is another frequent error. Even if you calculate correctly, a number without its unit is not a complete scientific statement. Make a habit of writing units as you go.
遗漏单位是另一个常见错误。即便你计算正确，没有单位的数字也不是一个完整的科学陈述。养成写答案时同时带上单位的习惯。
Giving vague or incomplete descriptions: if you are asked to describe a trend and you only write "it goes up", you will not get the mark. You need to say what goes up, between which values, and over what range.
描述模糊或不完整：如果要求描述趋势而你只写“它上升了”，那将得不到分。你要说清楚什么上升了、在哪些数值之间、在什么范围内。
Writing contradictory statements: in an explain question, if you write two conflicting ideas, the examiner may not know which one to credit. Re-read your answer and delete any part that says the opposite of the main point.
写出互相矛盾的语句：在解释题中，如果你写了两个冲突的观点，考官可能不知道要给哪个加分。重新读一遍你的答案，删掉任何与主要观点相反的部分。
Leaving blank spaces: if you don't know the full answer, write down whatever you do know that is relevant. You might pick up a mark for a correct partial response. Never leave a question completely unanswered.
留空不答：如果你不知道完整的答案，就把你知道的相关内容写下来。你或许能因部分正确的回答而得到一分。绝不要把问题完全空着。
8. Making the Most of Revision and Exam Time | 充分利用复习和考试时间
Active revision beats passive reading. Create flashcards with key terms on one side and definitions on the other. Draw mind maps linking topics like cells, forces, and elements. Practise past questions under timed conditions.
主动复习胜过被动阅读。制作一面写关键词、另一面写定义的闪卡。画出思维导图，把细胞、力、元素等主题联系起来。在限时条件下练习以往的考题。
In the exam, allocate time according to marks. If a paper is 60 marks for 60 minutes, spend roughly one minute per mark. A 6-mark question deserves about 6 minutes. Move on if you are stuck, and come back at the end.
考试时根据分值分配时间。如果一份考卷 60 分钟 60 分，那就大约一分钟得一分。一道 6 分的问题值得花大约 6 分钟。如果卡住了就先往下做，最后再回来。
Read the question twice before answering. Use the first reading to understand the scenario, and the second to highlight command words and data to quote. This helps avoid simple misinterpretation errors.
回答问题前把题目读两遍。第一遍读懂情景，第二遍标出指令词以及要引用的数据。这有助于避免简单的理解错误。
Leave a few minutes at the end to check units, spellings of key terms, and whether you have answered every part. A quick scan often catches empty answer spaces or missing units.
最后留几分钟检查单位、关键术语的拼写，以及是否每个部分都已作答。快速扫视往往能发现空的答题处或遗漏的单位。
9. How Mark Schemes Are Applied (WJEC Specific) | 评分标准的应用（WJEC 特色）
WJEC mark schemes at Year 7 are generally point-marked. This means each correct fact or step you provide attracts one mark, up to the maximum. Examiners do not usually take marks off for wrong information, provided it does not contradict the correct answer.
七年级的 WJEC 评分标准通常是逐点给分的。这意味着你每提供一个正确的事实或步骤，就能得一分，直到达到满分。通常考官不会因为你写出了错误信息而扣分，只要那些错误不与正确答案相矛盾。
If a question says "Give two reasons why..." and you give three, but one is incorrect, you will still get marks for the two correct ones. However, if the wrong reason contradicts the correct ones, the examiner might not know which to accept. So stick to the required number of points.
如果题目说 "Give two reasons why..." 而你给出了三条，其中一条错误，你仍然能得到两条正确理由的分数。但如果错误理由与正确理由相互矛盾，考官可能无从判断该接受哪一个。所以尽量按题目要求的要点数量作答。
In extended questions, examiners look for a 'Quality of Written Communication' aspect in some WJEC specifications – even at Year 7 level, clear organisation and correct spelling of scientific words influence the final judgment. Use full sentences and logical linking words.
在扩展题中，某些 WJEC 考纲中会有“书面表达质量”的考量——即便在七年级层次，清晰的条理和正确的科学词汇拼写也会影响最终评判。要用完整的句子和逻辑清晰的连接词。
Some questions include 'indicative content' in the mark scheme: a list of possible points. You do not have to include every point, but you need enough to reach the mark band. Bullet points are acceptable if the question does not specifically ask for continuous prose.
有些题目的评分方案里包含“参考性内容要点”：一份可能得分的要点清单。你不需要写全所有要点，但必须写出足够多的内容以达到对应分数段。如果题目没有明确要求连续文段，可以用项目符号。
10. Applying Knowledge to Unfamiliar Contexts | 将知识应用于陌生情境
WJEC likes to set questions that place scientific concepts in new situations — perhaps a strange animal, an unfamiliar chemical reaction, or a novel experiment. These questions are not testing new science; they are testing whether you can recognise the underlying science you have already learned.
WJEC 喜欢将科学概念置于新情境中出题——或许是某种奇怪的动物、一个陌生的化学反应，或一个新颖的实验。这些题并不是在考新的科学知识，而是在考你是否能识别出已经学过的核心科学原理。
When you see an unfamiliar scenario, start by identifying the key science topic. Read the stem carefully and pick out any words that remind you of a topic: "membrane", "cell wall", "force", "dissolved", "respiration". Then apply the relevant rule or law.
当你看到陌生情境时，首先要确定关键的科学主题。仔细阅读题干，找出能让你想起某个主题的词语：“膜”、“细胞壁”、“力”、“溶解”、“呼吸”。然后套用相关的规则或定律。
For example, a question might describe "a robot that explores the ocean floor" and ask why it needs strong structures. You immediately link this to forces and pressure. Your answer could be: "At the bottom of the ocean, water pressure is very high. The structure must be strong to withstand this pressure without being crushed."
例如，一道题可能描述“一个探索海底的机器人”并问为什么它需要坚固的结构。你马上联想到力和压强。你的答案可以是：“在海底，水压非常高。结构必须坚固，才能承受住这种压力而不被压垮。”
Trust your scientific knowledge. The situation may look different, but the science hasn't changed. If in doubt, think about what practical you did in class that relates to it. Write
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