📚 Year 7 WJEC Biology: In-depth Analysis of Past Papers | 七年级 WJEC 生物：历年真题深度解析
WJEC Year 7 Biology past papers offer a valuable opportunity to understand how foundational life science concepts are assessed. This guide breaks down recurring question types, key topics, and the best methods to structure your answers for top marks. Whether you are preparing for an end-of-topic test or a full school exam, a careful analysis of past papers will sharpen both your subject knowledge and exam technique.
WJEC 七年级生物历年真题为了解基础生命科学概念的考查方式提供了宝贵的机会。本指南将拆解常见的题型、关键主题，以及组织答案以获得高分的最佳方法。无论你是在准备单元测验还是完整的校内考试，仔细分析历年真题都会同时提升你的学科知识和考试技巧。
1. Understanding the Exam Structure | 了解考试结构
Typical Year 7 WJEC biology papers are divided into short-answer questions, data interpretation tasks, and a few extended writing questions. Many papers begin with a simple recall question, such as labelling a diagram of a plant cell or naming the organs of the digestive system. Later sections often test application by asking you to explain why a farmer might house pigs indoors, linking biology to real-world scenarios.
典型的七年级 WJEC 生物试卷分为简答题、数据分析题以及少量的拓展写作题。许多试卷以简单的记忆题开始，例如给植物细胞图标注或说出消化系统的器官名称。后面的部分通常考查应用能力，要求你解释农民为什么可能在室内养猪，将生物学与现实情境联系起来。
2. Cells and Microscopy | 细胞与显微镜使用
‘ dria. Past papers also frequently ask about the differences between plant and animal cells – you to calculate magnification using the formula: magnification = size of image ÷ real size of object.
“标注动物细胞的结构”是最常见的七年级题目之一。要求标注的结构是细胞核、细胞质、细胞膜和线粒体。历年真题也经常考查动植物细胞的区别——细胞壁、中央大液泡和叶绿体的存在是三大关键区别。有些题目会提供显微照片，并要求你使用公式放大倍数 = 图像大小 ÷ 实际物体大小来计算放大率。
| Feature | Animal Cell | Plant Cell |
|---|---|---|
| Cell wall | Absent | Present (made of cellulose) |
| Chloroplasts | Absent | Present in green parts |
| Vacuole | Small, temporary | Large, permanent |
特征比较 | 动物细胞 | 植物细胞：细胞壁 无/有（纤维素）；叶绿体 无/有（绿色部分）；液泡 小而临时/大而永久。
al magnification is calculated by multiplying the eyepiece lens magnification by the objective lens magnification. A typical answer: Total magnification = 10× × 40× = 400×.
当历年真题考查显微镜使用技能时，期望你答出先用粗准焦螺旋调焦，再用细准焦螺旋。总放大倍数的计算方法是目镜放大倍数乘以物镜放大倍数。典型答案：总放大倍数 = 10× × 40× = 400×。
3. Classification and Biodiversity | 分类与生物多样性
Year 7 WJEC papers often present a table of organisms and ask you to classify them into the five kingdoms: Animals, Plants, Fungi, Protists and Prokaryotes. You need to recognise that fungi such as mushrooms feed by saprotrophic nutrition (digesting food outside their bodies), while plants are autotrophs. Prokaryotes like bacteria have no nucleus – a distinction frequently tested in multiple-choice questions.
七年级 WJEC 试卷常给出一个生物表格，要求你将其归类到五界：动物界、植物界、真菌界、原生生物界与原核生物界。你需要识别出蘑菇等真菌通过腐生营养方式取食（在体外消化食物），而植物是自养生物。像细菌这样的原核生物没有细胞核——这是选择题中经常考查的区别。
A common data question shows four unfamiliar organisms and asks you to design a classification key. The key uses pairs of opposite statements, for example, ‘Does it have wings?’ The best answers use easily observable features such as the number of legs or the presence of antennae. Past paper mark schemes reward clear, logical steps that anyone could follow.
常见的数据题会给出四种不熟悉的生物，要求你设计一个分类检索表。检索表使用成对相反的陈述，例如“它有翅膀吗？”。最佳答案使用容易观察的特征，如腿的数量或触角的有无。历年真题评分方案会奖励清晰、合乎逻辑且任何人都能遵循的步骤。
4. Human Digestion and Enzymes | 人体消化与酶
Questions on the digestive system routinely ask you to sequence the organs: mouth, oesophagus, stomach, small intestine, large intestine, rectum, anus. Past papers go further by linking each organ to its function. The stomach, for example, churns food and produces protease enzymes and hydrochloric acid. You may be asked to explain why the stomach acid does not digest the stomach lining – the answer is mucus, which coats and protects the stomach wall.
关于消化系统的题目通常要求你排列器官顺序：口腔、食道、胃、小肠、大肠、直肠、肛门。历年真题会进一步联系每个器官的功能。例如，胃搅拌食物并产生蛋白酶和盐酸。你可能会被问到为什么胃酸不消化胃壁——答案是黏液，它覆盖并保护胃壁。
Enzyme action is introduced in Year 7 using the lock-and-key model. A typical exam question states: ‘Amylase breaks down starch into sugars. Explain why amylase will not break down proteins.’ The mark scheme requires you to state that the enzyme’s active site has a specific shape that only fits the substrate molecule (starch), so a protein molecule cannot bind. Using the term ‘complementary shape’ can strengthen the answer.
七年级引入酶的作用时会使用锁钥模型。典型的考题陈述：“淀粉酶将淀粉分解为糖。解释为什么淀粉酶不会分解蛋白质。”评分方案要求你答出酶的活性部位具有特定形状，只能与该底物分子（淀粉）契合，因此蛋白质分子无法结合。使用“互补形状”一词能使答案更出彩。
5. The Respiratory System and Gas Exchange | 呼吸系统与气体交换
Past papers often show a diagram of the thorax and ask you to label the trachea, bronchi, lungs, ribs and diaphragm. The function-word ‘inspiration’ (breathing in) is tested by asking which muscles contract and what happens to the volume and pressure inside the chest. The diaphragm contracts and flattens, the intercostal muscles lift the ribcage up and out, so the chest volume increases and pressure drops, drawing air into the lungs.
历年真题常给出胸腔示意图，要求你标注气管、支气管、肺、肋骨和膈。功能词“吸气”会通过提问哪些肌肉收缩以及胸腔容积和压力的变化来考查。膈肌收缩变平，肋间肌使肋骨上提向外，因此胸腔容积增大，压力下降，空气被吸入肺中。
Gas exchange is often linked to exercise. A six-mark question might provide heart rate data before and after running. You need to describe that during exercise muscles need more energy, which is released by increased respiration. This uses up oxygen and produces more carbon dioxide, so breathing rate and depth increase to take in more oxygen and remove CO₂ more quickly. The word ‘diffusion’ is expected in top-grade answers when explaining how gases move from a high concentration to a low concentration in the alveoli.
气体交换常与运动相联系。一道6分题可能给出跑步前后的心率数据。你需要描述运动时肌肉需要更多能量，这通过增强的呼吸作用释放。这一过程消耗氧气并产生更多二氧化碳，因此呼吸频率和深度增加，以更快地摄入氧气并排出二氧化碳。在解释肺泡中气体如何从高浓度向低浓度移动时，高分答案中会出现“扩散”一词。
6. Photosynthesis and Plant Transport | 光合作用与植物运输
oxygen, in the presence of light and chlorophyll. Many WJEC questions ask you to interpret experiments where a leaf is tested for starch. The leaf must be boiled in water, then heated in ethanol to remove chlorophyll, and iodine solution is added. A blue-black colour indicates starch is present, proving photosynthesis happened.
七年级学生需要记住光合作用的文字表达式：二氧化碳 + 水 → 葡萄糖 + 氧气，需要光和叶绿素。许多 WJEC 题目要求解读检验叶片中淀粉的实验。叶片需在沸水中加热，然后在乙醇中加热以去除叶绿素，再加入碘液。出现蓝黑色表示存在淀粉，证明光合作用发生了。
A recurring question asks how the leaf is adapted for photosynthesis. The mark scheme looks for: large surface area to absorb light; thin shape for quick diffusion of gases; many chloroplasts packed with chlorophyll; and stomata on the lower epidermis to allow carbon dioxide to enter. To explain the role of xylem and phloem, state that xylem transports water and minerals from the roots, while phloem transports dissolved sugars (translocation).
常考的一个问题是叶片如何适应光合作用。评分标准希望看到：表面积大以吸收光照；叶片薄以便气体快速扩散；含有大量叶绿素的许多叶绿体；下表皮有气孔允许二氧化碳进入。解释木质部和韧皮部的作用时，需要说明木质部从根部运输水和矿物质，而韧皮部运输溶解的糖（转运作用）。
7. Reproduction in Plants and Humans | 动植物的繁殖
Flower structure is a favourite topic. Typical labels include petals, anther, filament, stigma, style and ovary. Past papers ask you to state that the anther produces pollen (male gamete) and the ovary contains ovules (female gametes). Pollination is the transfer of pollen from anther to stigma; fertilisation is the fusion of the male and female gamete nuclei. Wind-pollinated flowers are compared with insect-pollinated ones: they have dull petals, no scent, and produce lots of light pollen.
花的结构是热门考点。常见标注包括花瓣、花药、花丝、柱头、花柱和子房。历年真题要求你陈述花药产生花粉（雄性配子），子房含有胚珠（雌性配子）。传粉是花粉从花药传到柱头；受精是雌雄配子核的融合。风媒花与虫媒花相比较：它们具有色泽暗淡的花瓣、无香气，并产生大量轻质花粉。
ct → urethra → vagina → cervix → uterus → oviduct. A fertilised egg (zygote) implants into the thickened lining of the uterus. The placenta, which develops later, allows oxygen and nutrients to pass from the mother’s blood to the baby’s blood, but does not allow the two blood supplies to mix.
在人类生殖问题中，你可能被要求描述精子细胞从睾丸到卵子的行程。顺序为：睾丸 → 输精管 → 尿道 → 阴道 → 子宫颈 → 子宫 → 输卵管。受精卵（合子）植入增厚的子宫内膜。随后发育的胎盘允许氧气和营养物质从母体血液传递给婴儿血液，但二者的血液并不混合。
8. Food Chains, Webs and Ecosystems | 食物链、食物网与生态系统
fy the producer (grass) and the primary and secondary consumers. Past papers then ask what would happen to the rabbit population if all the foxes were removed. Answer: the rabbit population would increase initially, but then maybe crash because of overgrazing and disease. This shows predator-prey cycles, a concept often plotted in graph-analysis questions.
经典的题目给出食物链：草 → 兔 → 狐狸。你必须辨识出生产者（草）以及初级和次级消费者。历年真题接着会问如果所有狐狸都被消灭，兔子的数量会如何变化。答案：兔子的数量起初会增加，但随后可能因过度啃食和疾病而骤减。这体现了捕食者-猎物循环，这是一个常在图表分析题中出现的概念。
Energy transfer between trophic levels is typically tested with a pyramid of numbers. You might need to explain why there are usually fewer organisms at the top of the chain. Look for the phrasing: energy is lost at each level through movement, heat and uneaten parts, so only around 10% of energy is passed on. Bioaccumulation of toxins like DDT along a food chain is another common analysis question.
营养级之间的能量传递通常用数量金字塔来考查。你可能需要解释为什么食物链顶端的生物通常数量较少。需要留意这样的表述：能量在每个层级都通过运动、散热和未被取食的部分而损失，因此只有大约10%的能量被传递下去。像 DDT 这样的毒素沿食物链的生物累积是另一种常见的分析题。
9. Variation, DNA and Inheritance | 变异、DNA 与遗传
Year 7 WJEC papers distinguish between inherited variation (eye colour, natural hair colour) and environmental variation (scars, language, dyeing hair). A question might show a graph of hand spans in a class; the continuous variation produces a bell-shaped curve. Genetic information is carried on chromosomes in the nucleus. The small section of a chromosome that codes for a particular characteristic is called a gene.
七年级 WJEC 试卷会区分遗传变异（眼色、天然发色）和环境变异（伤疤、语言、染发）。一道题可能展示班级中手的指距的图表；连续变异呈现出钟形曲线。遗传信息由细胞核中的染色体携带。染色体上编码特定特征的一小段叫作基因。
Simple inheritance is often taught using the example of attached or free earlobes, or using Mendel’s peas. Although Year 7 does not require Punnett squares in great depth, you might be asked to state that a dominant allele will express its characteristic even if only one copy is present, whereas a recessive allele requires two copies. Past paper wording: ‘Explain why two parents without a genetic disorder can have a child with the disorder if the condition is recessive.’ Answer: both parents are carriers, having one normal dominant allele and one disease-causing recessive allele.
简单遗传通常用耳垂附着或游离的例子或者孟德尔的豌豆来教学。尽管七年级不需要深入掌握庞纳特方格，但你可能会被问到显性等位基因即使只有一个副本也会表达其特征，而隐性等位基因则需要两个副本。历年真题的措辞：“隐形遗传病中，两个没有患病的父母为何能生出一个患病的后代？”答案：父母双方都是携带者，他们分别拥有一个正常的显性等位基因和一个致病的隐性等位基因。
10. Health, Lifestyle and Disease | 健康、生活方式与疾病
Pathogens (microorganisms that cause disease) are a core topic. Questions distinguish between bacteria (reproduce rapidly by splitting, can be killed by antibiotics) and viruses (much smaller, take over host cells, not affected by antibiotics). You are expected to use the terms ‘transmission’, ‘symptoms’ and ‘prevention’. A common data question provides a graph showing the number of measles cases before and after the introduction of a vaccination programme.
病原体（引起疾病的微生物）是核心主题。题目会区分细菌（通过分裂快速繁殖，可被抗生素杀死）和病毒（小得多，接管宿主细胞，抗生素对其无效）。你需要使用“传播”、“症状”和“预防”等术语。常见的数据题会提供一幅曲线图，展示疫苗接种计划引入前后麻疹病例的数量。
Lifestyle factors are tested with coronary heart disease. A table may compare the risk of heart disease for smokers and non-smokers. You need to explain that smoking narrows arteries and raises blood pressure because chemicals like nicotine and carbon monoxide damage the circulatory system. Balanced diet questions require you to explain that a diet high in saturated fat and cholesterol can increase the risk of blocked arteries, while regular exercise strengthens the heart muscle.
生活方式因素会结合冠心病进行考查。表格可能比较吸烟者和非吸烟者患心脏病的风险。你需要解释吸烟会使动脉变窄并升高血压，因为尼古丁和一氧化碳等化学物质会损害循环系统。有关平衡膳食的题目要求你说明，富含饱和脂肪和胆固醇的饮食会增加动脉阻塞的风险，而定期锻炼则能增强心肌。
11. Exam Technique: Command Words and Mark Allocation | 考试技巧：指令词与分值分配
WJEC mark schemes consistently reward precise biological vocabulary. ‘Name’ questions require only one or two words. ‘Describe’ means say what happens (often a sequence of events). ‘Explain’ requires giving a scientific reason, usually using ‘because’. When you see a 6-mark question, it is asking for a logical, well-structured paragraph that links several ideas together. Bullet points are acceptable if the answer stays coherent, but full sentences are safer.
WJEC 的评分方案一贯奖励精确的生物学词汇。“说出”类题目只需要一两个词。“描述”意味着说出发生的事情（通常是一系列事件的顺序）。“解释”则需要给出科学原因，通常使用“因为”。当你看到一道6分题时，它要求的是逻辑清晰、结构良好的段落，将多个观点串联起来。如果答案保持连贯，分点作答可以接受，但使用完整句子更为稳妥。
A major mistake in past papers is confusing cause and effect. For example, stating ‘the diaphragm relaxes, therefore air rushes out’ is more accurate than ‘air rushes out, causing the diaphragm to relax’. Another frequent error is not reading the scale on graphs correctly, leading to incorrect data quotes. Always check whether the question asks for a trend or a specific data point. Highlight keywords in the question before you start writing.
历年真题中一个主要错误是混淆因果关系。例如，表述“膈肌舒张，因此空气冲出”比“空气冲出，导致膈肌舒张”更为准确。另一个常见错误是没有正确读取图表上的刻度，导致引用的数据出错。请始终确认题目是要求描述趋势还是具体的数值点。开始作答前，在题目中高亮关键词。
12. Practice Questions and Model Answers | 真题精练与范例答案
Question 1 (3 marks): ‘Explain why the small intestine is adapted for absorbing digested food.’ Model answer: It is very long, which provides a large surface area for absorption. Its inner wall is covered with millions of tiny finger-like villi, which further increase the surface area. The villi have a thin, single layer of cells and a good blood supply, so dissolved food molecules can quickly diffuse into the blood.
题目1（3分）：“解释小肠为何适于吸收已消化的食物。”范例答案：它非常长，为吸收提供了巨大的表面积。其内壁覆盖着数百万细小的指状绒毛，进一步增大了表面积。绒毛只由一层薄薄的细胞构成且具有丰富的血液供应，因此溶解的食物分子能快速扩散进入血液。
Question 2 (5 marks): ‘A student places a potted plant near a window. After a week, the plant’s stem bends towards the light. Name this response and explain how it happens.’ Model answer: This response is called phototropism. The plant hormone auxin moves to the shaded side of the stem, causing the cells there to elongate more than those on the bright side. As a result, the stem bends towards the light source. This increases the amount of light leaves receive for photosynthesis, improving the plant's growth.
题目2（5分）：“一名学生把一盆盆栽植物放在窗边。一周后，植物的茎弯向光照方向。请给此反应命名并解释其发生机制。”范例答案：这种反应叫作向光性。植物激素生长素移动到茎的背光侧，导致该处的细胞比向光一侧的细胞伸得更长。因此，茎弯向光源。这增加了叶片接受的光照量，有利于光合作用，从而促进植物生长。
Question 3 (6 marks): ‘ s a physical process that moves air in and out of the lungs. It involves muscular movement — ergy from glucose. The word equation for aerobic respiration is glucose + oxygen → carbon dioxide + water (+ energy). Breathing supplies the oxygen needed for respiration and removes the waste carbon dioxide produced. They are closely linked but are not the same thing.
题目3（6分）：“比较呼吸运动与呼吸作用的过程。”范例答案：呼吸运动是一种物理过程，使空气进出肺部。它涉及肌肉运动——膈肌和肋间肌。而呼吸作用是一种化学反应过程，发生在每个活细胞内部。它从葡萄糖中释放能量。有氧呼吸的文字表达式为：葡萄糖 + 氧气 → 二氧化碳 + 水（+ 能量）。呼吸运动为呼吸作用提供所需的氧气，并排出产生的废气二氧化碳。两者紧密相关，但并不是一回事。
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