WJEC GCSE生物 两份笔试 科学探究 实验设计
WJEC GCSE 生物是威尔士的独立科学资格，由威尔士联合教育委员会命题、Qualifications Wales 监管。它不换成英格兰的 9 到 1 分制，仍旧使用 A* 到 G 的字母等级。整门课只有三份单元，两份笔试各 1 小时 45 分钟，第三份是科学探究。下面按单元顺序拆开考点，同时说明每一类题的给分位置。
WJEC GCSE Biology is the separate science qualification written for schools in Wales and regulated by Qualifications Wales rather than Ofqual. It keeps letter grades and assesses content through two written papers plus one enquiry task. This guide walks through the units in the order they are taught and points out where marks are actually won or lost.
考试结构：两份笔试各占四成五，科学探究占一成
单元一与单元二都是 1 小时 45 分钟、各 80 分、各占 45%，题型在短答、结构题、延伸写作与数据分析之间混排。单元三是科学探究，占 10%、28 分，考生从两个给定的探究里挑一个。按 WJEC 官网 2026 年 2 月发布的 specification 第 3 版，新的单元三从 2026 年 9 月起施教、2028 年夏季首次发证。一场接近两小时的卷子看着宽裕，写满三个大题之后时间就不多了。很多学生以为笔试只考背诵，翻到数据分析题才发现要读图、算比值、把结论写成句子。
WJEC GCSE Biology in Wales is built from three units rather than one long exam. Units 1 and 2 carry 45 per cent each, both last 1 hour 45 minutes and both are marked out of 80, while Unit 3 adds the remaining 10 per cent through a scientific enquiry. The enquiry version of Unit 3 was introduced for first teaching in September 2026 and is awarded from summer 2028, according to the version 3 specification published on the WJEC website in February 2026.
分层与等级：Higher 到 D，Foundation 到 G
WJEC 生物保留字母等级，没有跟着英格兰换成数字分数。Higher Tier 覆盖 A* 到 D，Foundation Tier 覆盖 C 到 G，单元三两个层级都要考且不分层。学校通常在开学后头几周才最终定层，模考成绩是主要依据。定层之后课堂进度会明显分开，Higher 班多讲延伸计算，Foundation 班反复练基础定义。往上调层比往下调难，家长和学生在定层前就该把两份卷子的差异看清楚。
Wales kept letter grades, so candidates are entered for Higher Tier, covering A* to D, or Foundation Tier, covering C to G. Unit 3 is untiered, which means a strong enquiry task supports the final grade on either route. Tier decisions are usually settled after the first set of mocks, since moving up later is harder than moving down once teaching has diverged.
单元一 1.1 细胞结构、显微镜与放大倍数
动物细胞与植物细胞都要能画、能标注、能写出每一部分的功能。细胞膜控制物质进出，细胞质是多数反应的场所，细胞核带染色体并控制细胞活动，线粒体是需氧呼吸的场所。植物细胞另有纤维素细胞壁提供支撑，叶绿体是光合作用的场所，液泡里的细胞液让细胞保持坚挺。放大倍数等于目镜倍数乘物镜倍数，光学显微镜有上限，电子显微镜倍数更高但只能观察死组织。很多学生以为倍数越大看得越清楚，实际上视野会变小、亮度会下降。常见的错误是把两个镜头的倍数相加，而不是相乘。
Cell structure questions reward precise statements about function rather than a page of labels. Magnification is the eyepiece power multiplied by the objective power, and a light microscope has a fixed ceiling that the electron microscope exceeds while only showing dead tissue. Many candidates add the two powers together, which loses the mark before the arithmetic even starts.
单元一 1.2 气体交换与吸入呼出空气的差别
specification 直接给了数据：吸入空气约 21% 氧、0.04% 二氧化碳、78% 氮，水蒸气比例不定。呼出空气约 16% 氧、4% 二氧化碳、78% 氮，并且被水蒸气饱和。比较两者二氧化碳含量用石灰水加 huff and puff 装置，把空气压过石灰水看浑浊程度。肺泡的适应要写四条：表面积大、壁薄、内壁湿润、血液供应丰富。每一条都要接到扩散速率上，只写形容词拿不到分。阅卷时最常见的丢分就是写了表面积大，却没说清楚为什么扩散更快。
The specification gives the gas percentages directly: inspired air holds about 21 per cent oxygen and 0.04 per cent carbon dioxide, while expired air holds about 16 per cent oxygen, 4 per cent carbon dioxide and is saturated with water vapour. Alveoli are credited for a large surface area, a thin wall, a moist lining and a rich blood supply, and each feature has to be tied to the rate of diffusion. Calling the alveoli spongy without explaining the faster diffusion earns nothing.
单元一 1.3 消化、酶与食物能量测定
酶是蛋白质，由氨基酸连成链再折叠成特定形状，形状决定它能催化哪一种底物。温度过高会变性且不可逆，pH 偏离最适值活性下降。淀粉酶把淀粉分解成麦芽糖，蛋白酶把蛋白质分解成氨基酸，脂肪酶把脂肪分解成脂肪酸和甘油。胆汁由肝脏产生、储存在胆囊，乳化脂肪但不含酶。指定的食物能量实验是燃烧样品加热一定体积的水，用量热的方法估算能量含量。计算时样品质量、水温变化、水的比热容三个量都要写清单位。常见的错误是忽略热量散失到空气里，算出来的值偏大。
Enzymes are proteins folded into a shape that fits one substrate, and heat beyond the optimum destroys that shape permanently. Bile is made in the liver, stored in the gallbladder and emulsifies fat without containing any enzyme of its own. The specified food-energy practical asks candidates to burn a sample under a known volume of water, and the usual error is ignoring heat lost to the surroundings, which inflates the answer.
单元一 1.5 光合作用的限制因子与蒸腾测量
光合作用在叶绿体里进行，原料是二氧化碳和水，产物是葡萄糖和氧，能量来自光。限制因子指当下供应最少的那一项，提高其他因子不会让速率上升。温度过高时酶变性，速率反而下降。用 potometer 测吸水速率来近似蒸腾速率，枝条切口必须在水下完成，装置里不能留气泡。变量控制要写清光源距离、叶片面积、风速与计时长度。学生最常把蒸腾和呼吸混在一起，两者一个失水一个耗氧，方向完全不同。
Photosynthesis happens in chloroplasts and turns carbon dioxide and water into glucose and oxygen using light energy. The limiting factor is whichever input is in shortest supply, and raising anything else will not speed the reaction up. A potometer estimates transpiration from water uptake, so the shoot must be cut under water and the apparatus must be free of air bubbles.
单元一 1.6 生态系统与物质循环
能量通过生产者进入食物链，再沿消费者传递，最后通过呼吸、分解和排泄离开生物体。分解者把有机物里的元素还给土壤，供生产者再次利用。营养循环只考一般原理，硝酸盐循环的每一步不必背。人的活动通过破坏栖息地、排放污染与过度捕捞改变生态平衡。食物链题的箭头表示能量流动方向，不是谁吃谁的方向。写食物网时先数清有几条路径，再判断某个物种消失会影响哪些环节。
Energy enters a food chain through producers and leaves it through respiration, decomposition and excretion. Decomposers return elements locked in dead material to the soil, and only the general principle of cycling is examinable rather than the steps of the nitrate cycle. Arrows in a food chain show the direction of energy transfer instead of who eats whom.
单元二 2.2 与 2.3 细胞分裂、DNA 与遗传
有丝分裂产生两个遗传信息相同的子细胞，用于生长与修复。减数分裂产生配子，染色体数目减半，受精后恢复。基因是 DNA 上一段决定性状的序列，等位基因是同一基因的不同版本。显性、隐性、基因型、表现型四个词要分清，不能混用。画方阵图时配子写在格子外侧，子代基因型写进格子。概率的分母是全部格子，不是显性格子的数量。表现型比例要按题目问的顺序写，写反了按错处理。
Mitosis produces two genetically identical cells for growth and repair, while meiosis halves the chromosome number to make gametes. Alleles are different versions of the same gene, and dominant, recessive, genotype and phenotype have to be used precisely. In a genetic cross the gametes sit outside the grid and the offspring genotypes inside it, with probability calculated over every box.
单元二 2.4 变异、突变与自然选择
变异来自基因、环境或两者共同作用，突变提供自然选择可以利用的新等位基因。多数突变有害或中性，少数有利，这一点常被学生写反。电离辐射的剂量越高，发生突变的概率越大。自然选择的推理分四步：群体里本来就存在变异，环境对变异作出筛选，有利的个体更容易存活并繁殖，有利等位基因的频率逐代上升。抗生素耐药细菌是最常考的例子，原理与农药抗性完全相同。答题时要把每一步写出来，只写适者生存不得分。
Variation comes from genes, the environment, or an interaction of the two, and mutation supplies the new alleles that selection can act on. Most mutations are harmful or neutral, and the chance of mutation rises with the dose of ionising radiation. Natural selection works because variants that suit the environment survive and reproduce more often, so their alleles become commoner over generations.
单元二 2.5 与 2.6 反射、血糖与肾脏稳态
感受器是成组的受体细胞，分别对光、声、触、温度与化学物质作出反应，再把信息以电脉冲沿神经送到中枢神经系统。反射弧的顺序是感受器、感觉神经、中枢、运动神经、效应器，顺序颠倒就丢分。肾脏调节血液含水量并清除代谢产生的废物。水过多时排出稀尿，水不足时垂体释放抗利尿激素，排出浓缩尿。血糖由胰岛素与胰高血糖素双向调节。学生最常把抗利尿激素写成促进排尿，方向正好相反。
A reflex arc runs from receptor through a sensory neurone to the central nervous system, then out along a motor neurone to an effector. The kidneys control water content and remove the waste products of metabolism, producing dilute urine when water is plentiful and concentrated urine when it is scarce. Antidiuretic hormone from the pituitary makes the kidney reabsorb more water, which is the opposite of what many students write.
单元二 2.7 与 2.8 微生物、免疫与抗药性
疫苗使用灭活微生物、抗原或抗原片段，刺激免疫反应而不引起疾病，让身体提前产生抗体。白细胞吞噬病原体，淋巴细胞产生针对特定抗原的抗体。抗生素只对细菌有效，对病毒没有作用。抗药性来自存活下来的细菌继续繁殖，不是细菌主动学会了抵抗。抗菌实验要写清无菌操作、对照平板与抑菌圈的测量方法。培养皿要在合适温度下培养，温度过高会促进病原菌繁殖，学校实验通常不超过 25 摄氏度。
Vaccines contain inactive microorganisms, antigens or parts of antigens that trigger an immune response without causing disease. White blood cells engulf pathogens, and lymphocytes release antibodies that match one specific antigen. Antibiotics act on bacteria only, and resistance spreads because surviving bacteria reproduce rather than because bacteria learn to resist.
评分目标与数学技能：应用知识占四成一
WJEC 官网给出的权重是 AO1 占 38.5%、AO2 占 41%、AO3 占 20.5%。也就是说接近一半的分用在把知识用到新材料上，光背定义拿不到高分。数学技能至少占 10%，科学探究技能至少占 15%，两项都写在 specification 里。常考的数学包括百分比与百分比变化、从图像读取速率、表面积与体积之比、单位换算与标准形式。算完之后回看一眼数量级，能挡掉大部分低级错误。单位不写或写错，过程对也不给分。
The published weightings are AO1 at 38.5 per cent, AO2 at 41 per cent and AO3 at 20.5 per cent, so almost half the marks reward applying knowledge to unfamiliar data. Mathematical skills carry at least 10 per cent and scientific enquiry at least 15 per cent of the total. Percentage change, rates from graphs, surface area to volume ratio and unit conversion appear most often.
单元三科学探究：一小时实践加一小时书面
单元三由 WJEC 命题，在中心内实施，再由 WJEC 统一外部评分。考试安排在春季学期前半段，也就是一月到二月，学校一般放在最后一学年完成。考生从两个探究里选一个，实践任务一小时，书面任务一小时，合计 28 分。书面部分考设计、变量、数据处理与证据的评价。分数不计入分层，Foundation 考生也可能在这里拿高分。2026 年 9 月开教，2028 年夏季首次计分，旧版单元三的成绩不能再沿用。
Unit 3 is set by WJEC, carried out in the centre and marked externally, and it runs in the first half of the spring term between January and February. Candidates choose one enquiry from two, then face a one-hour practical task and a one-hour written task worth 28 marks in total. The written paper asks about design, variables, interpretation and the limits of the evidence collected.
复习节奏与常见失分点
两份笔试卷的题型完全一致，短答、结构、延伸写作与数据分析混排，所以时间分配可以照着练。延伸写作要写完整句子，术语要准确，不要用口语替换科学名词。数据分析先看两轴的单位与量程，再看趋势与异常点，最后写一句结论。很多学生以为写出数字就算答完，其实结论句才给分。复习时按单元切块，每块配一次限时练习，比通读课本有效得多。做完订正时把丢分原因写成一句话，下一轮只看这一句。
Both written papers mix short answers, structured questions, extended writing and data response, so timing has to be rehearsed rather than improvised. Extended answers need full sentences and precise terminology, and a number without a concluding sentence rarely scores. Reading the axes and units before describing a trend saves more marks than writing faster.
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