📚 Year 8 WJEC Biology: Summer Preview & Bridging Course | Year 8 WJEC 生物：暑期预习与衔接课程
Welcome to your Year 8 WJEC Biology summer preparation guide. This bridging resource is designed to strengthen your Year 7 foundations and introduce the key topics you will explore in Year 8 – from cell structures and body systems to ecosystems and inheritance. By working through these sections, you will build a clear mental map of living processes, develop scientific vocabulary and gain confidence ahead of the new term.
欢迎使用 Year 8 WJEC 生物暑期预习指南。这本衔接资料旨在巩固你在 Year 7 所学的基础，并提前了解 Year 8 将探讨的核心主题——从细胞结构、人体系统到生态系统与遗传。通过学习这些章节，你将构建一个清晰的生命过程思维导图，积累科学词汇，为新学期树立信心。
1. The Big Picture of Year 8 Biology | Year 8 生物课程概览
Year 8 WJEC Biology builds directly on Year 7 topics such as cells, reproduction and feeding relationships. This year you will look deeper into how organisms are organised, how body systems work together and how traits are passed from one generation to the next.
Year 8 WJEC 生物直接建立在 Year 7 的细胞、生殖与摄食关系等主题之上。这一年你将更深入地了解生物体如何组织、身体系统如何协同工作，以及性状如何在世代间传递。
You will also begin to use microscopes with greater skill, design simple investigations and collect data to support conclusions. The course encourages you to think like a biologist – asking questions, making predictions and linking structure to function.
你还将进一步熟练使用显微镜，设计简单的探究实验并收集数据以支持结论。课程鼓励你像生物学家一样思考——提出问题、作出预测并将结构与功能联系起来。
A summer preview helps you recognise the connections between topics early on, so that digestion, gas exchange and plant nutrition feel like parts of one big story rather than isolated facts.
暑期预习能帮助你尽早识别各主题之间的联系，让消化、气体交换和植物营养等内容成为一个完整故事，而不是孤立的知识点。
2. Cells and Microscopy | 细胞与显微技术
All living organisms are made of cells. Animal cells typically contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells share these parts but also have a rigid cell wall, a large permanent vacuole and chloroplasts for photosynthesis.
所有生物体都由细胞组成。动物细胞通常具有细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞除了这些结构，还有坚硬的细胞壁、一个中央大液泡以及进行光合作用的叶绿体。
Microscopes allow us to observe cells in detail. In Year 8 you will learn to prepare a wet mount slide, use the coarse and fine focus knobs, and calculate total magnification by multiplying the eyepiece lens power by the objective lens power.
显微镜让我们能细致地观察细胞。在 Year 8 你将学会制作临时装片、使用粗准焦螺旋和细准焦螺旋，并通过目镜倍数乘以物镜倍数计算总放大倍数。
Stains such as iodine solution or methylene blue help make cell structures more visible. When you draw what you see under the microscope, always use a sharp pencil, label the visible parts and write down the magnification used.
碘液或亚甲基蓝等染剂可以让细胞结构更清晰可见。在显微镜下绘图时，务必使用削尖的铅笔，标出所见的各个部分并注明使用的放大倍数。
The following table compares animal and plant cells you are expected to recognise:
下方表格比较了你需要辨别的动物细胞与植物细胞：
| Feature | Animal Cell | Plant Cell |
|---|---|---|
| Nucleus | Present | Present |
| Cell membrane | Present | Present |
| Cell wall | Absent | Present (made of cellulose) |
| Chloroplasts | Absent | Present in green parts |
| Vacuole | Small, temporary | Large, permanent |
3. From Cells to Living Systems | 从细胞到生命系统
Cells of a similar type group together to form a tissue. For example, muscle tissue is made of muscle cells that can contract. Tissues then work together to form an organ, such as the stomach, which contains muscle tissue, glandular tissue and epithelial tissue.
相似类型的细胞聚集在一起形成组织。例如，肌肉组织由能够收缩的肌细胞构成。组织再进一步协同形成器官，比如胃，它包含肌肉组织、腺体组织和上皮组织。
Organs are arranged into organ systems that carry out major life functions. The digestive system, circulatory system and respiratory system are three interconnected systems you will study in detail this year.
器官又组合成器官系统，执行各种生命功能。消化系统、循环系统和呼吸系统是你今年将要深入学习的三个相互关联的系统。
Understanding the hierarchy – cells → tissues → organs → organ systems → organism – helps you see how a single change at the microscopic level can affect the whole body.
理解细胞→组织→器官→器官系统→生物体这一层级关系，能帮助你明白微观层面的单个变化如何影响整个身体。
This organisational theme is a recurring concept in WJEC Biology, so revising it early will make topics like digestion and gas exchange far easier to grasp.
这一组织层级是 WJEC 生物反复出现的核心概念，提前复习会使消化和气体交换等主题更容易掌握。
4. Digestion and Nutrition | 消化与营养
A balanced diet provides carbohydrates, proteins, lipids, vitamins, minerals, water and dietary fibre. Each nutrient has a specific role: carbohydrates supply energy, proteins support growth and repair, and lipids provide long-term energy storage and insulation.
均衡膳食提供碳水化合物、蛋白质、脂类、维生素、矿物质、水和膳食纤维。每种营养素都有特定作用：碳水化合物提供能量，蛋白质促进生长与修复，脂类用于长期储能和保温。
Digestion breaks large, insoluble food molecules into small, soluble ones that can be absorbed into the blood. This process involves both physical breakdown (chewing, churning) and chemical breakdown by enzymes.
消化将大分子、不溶性的食物分解成小分子、可溶性的物质，以便被血液吸收。这个过程包括物理分解（咀嚼、搅拌）和酶促化学分解。
Key enzymes include amylase, which breaks down starch into sugars, protease for proteins, and lipase for lipids. In Year 8 you will learn where each enzyme is produced and the conditions under which they work best.
关键酶包括将淀粉分解为糖的淀粉酶、分解蛋白质的蛋白酶和分解脂类的脂肪酶。Year 8 你将学习每种酶的生成部位及它们的最佳作用条件。
Use the simple word equation to remember what happens to starch in the mouth and small intestine:
用简单的文字方程式记住淀粉在口腔与小肠中的变化：
starch → maltose (by amylase)
The lining of the small intestine is adapted for absorption with millions of tiny finger-like villi, which provide a huge surface area to take up digested food into the bloodstream.
小肠内壁具有适应吸收的结构——数以百万计的指状绒毛，它们提供了巨大的表面积，将已消化的食物吸收进血液。
5. Breathing and Gas Exchange | 呼吸与气体交换
Breathing is the physical movement of air into and out of the lungs. It should not be confused with cellular respiration, which is the chemical release of energy from glucose inside cells.
呼吸是指空气进出肺部的物理运动，不要与细胞呼吸混淆。细胞呼吸是细胞内部从葡萄糖释放能量的化学过程。
During inhalation the intercostal muscles contract, the ribcage moves up and out, and the diaphragm flattens. This increases the volume of the chest cavity and draws air in. Exhalation is largely passive; the muscles relax and air is forced out.
吸气时肋间肌收缩，肋骨向上向外移动，膈肌变平，胸腔容积增大，空气被吸入。呼气则基本是被动的：肌肉放松，空气被排出。
Gas exchange happens in the alveoli – tiny air sacs surrounded by capillaries. Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses in the opposite direction. Both moves follow a concentration gradient.
气体交换发生在肺泡——被毛细血管包围的微小气囊中。氧气从肺泡扩散进血液，同时二氧化碳沿相反方向扩散。两气体均顺着浓度梯度移动。
Alveoli are well suited for this job: they are moist, have very thin walls (just one cell thick) and an enormous combined surface area. Model these adaptations clearly when you answer exam questions.
肺泡非常适合这一功能：湿润、壁极薄（仅一个细胞的厚度）且拥有巨大的总表面积。在回答考题时要清晰地描述这些适应性特征。
6. The Skeleton and Muscles | 骨骼与肌肉
The human skeleton provides support, protects vital organs, allows movement, and produces blood cells in the bone marrow. Bones are living tissues that can grow and repair themselves.
人体骨骼提供支撑、保护重要器官、实现运动并在骨髓中产生血细胞。骨骼是活组织，能够生长和自行修复。
Joints occur where two or more bones meet. Synovial joints, such as the knee and elbow, contain cartilage to reduce friction, synovial fluid for lubrication, and ligaments that hold bones together.
两块或更多骨相遇处形成关节。滑膜关节（如膝关节和肘关节）内含有减少摩擦的软骨、起润滑作用的滑液以及连接骨骼的韧带。
Muscles work in antagonistic pairs. When the biceps contracts, it pulls the forearm up (flexion); at the same time the triceps relaxes. To straighten the arm (extension), the triceps contracts and the biceps relaxes.
肌肉以拮抗对方式工作。肱二头肌收缩时，将前臂向上拉（屈曲）；此时肱三头肌舒张。若要伸直手臂（伸展），则肱三头肌收缩而肱二头肌舒张。
All movements rely on tendons attaching muscle to bone. Being able to name the key bones and muscles of the arm and leg is a frequent requirement in WJEC assessments.
所有运动都依靠肌腱将肌肉附着于骨骼。能够指认手臂和腿部的主要骨骼与肌肉是 WJEC 评估中的常见要求。
7. Microbes and Defence Against Disease | 微生物与防御疾病
Microorganisms, or microbes, include bacteria, viruses, fungi and some protists. While many are harmless or even helpful, a small number cause infectious diseases that can spread from person to person.
微生物包括细菌、病毒、真菌和一些原生生物。虽然许多微生物无害甚至有益，但少数会引起可在人际传播的传染病。
Bacteria are single-celled organisms that reproduce quickly by binary fission. Viruses are much smaller and can only reproduce inside a host cell. Understanding these differences is essential for knowing how treatments work.
细菌是单细胞生物，通过二分裂快速繁殖。病毒小得多，且只能在宿主细胞内繁殖。理解这些差异对于了解治疗方法的原理至关重要。
The body’s first line of defence includes the skin, tears and stomach acid. If microbes get inside, white blood cells fight them by engulfing pathogens, producing antibodies, or releasing antitoxins. This is the second line of defence.
身体的第一道防线包括皮肤、泪液和胃酸。如果微生物进入体内，白细胞通过吞噬病原体、产生抗体或释放抗毒素进行抵抗。这是第二道防线。
Vaccination introduces a harmless version of a pathogen to trigger antibody production, creating immunological memory. This means the body can respond rapidly if it encounters the real pathogen later.
疫苗接种将无害形式的病原体引入体内，以触发抗体产生并形成免疫记忆。这意味着如果之后遇到真正的病原体，身体可以快速作出反应。
8. Ecosystems and Feeding Relationships | 生态系统与摄食关系
An ecosystem includes a community of living organisms interacting with each other and their physical environment. Producers, usually green plants, capture light energy and convert it into food via photosynthesis.
生态系统包括生物群落与其物理环境之间的相互作用。生产者（通常是绿色植物）捕获光能并通过光合作用将其转化为食物。
Food chains show how energy is passed from one organism to another. A typical chain runs: producer → primary consumer → secondary consumer → tertiary consumer. Arrows represent the direction of energy flow.
食物链显示能量如何从一个生物传递给另一个。一条典型食物链是：生产者→初级消费者→次级消费者→三级消费者。箭头表示能量流动方向。
A food web is made up of many interconnected food chains. It reflects the fact that most animals eat more than one type of food. If one species is removed, the whole web can be affected.
食物网由许多相互连接的食物链组成。它反映了大多数动物不止吃一种食物的事实。如果某个物种被移除，整个食物网都可能受到影响。
Pyramids of number show the count of organisms at each trophic level, while pyramids of biomass are normally a better representation because they account for the mass of living material. Both can be examined in Year 8.
数量金字塔显示各营养级的生物个数，而生物量金字塔通常更能真实反映情况，因为它考虑的是生物材质的质量。两者在 Year 8 都可能涉及。
Toxic substances can accumulate in food chains – a process called bioaccumulation. This helps explain why top predators can be most affected by pollution.
有毒物质会在食物链中积累——这一过程称为生物富集。这有助于解释为什么顶级捕食者受污染影响最严重。
9. Plant Reproduction and Growth | 植物繁殖与生长
Flowering plants reproduce sexually. The male gametes (pollen) are produced in the anther, while the female gametes (ovules) are found inside the ovary. Pollination is the transfer of pollen from anther to stigma.
开花植物进行有性繁殖。雄配子（花粉）在花药中产生，雌配子（胚珠）位于子房内。传粉是将花粉从花药转移到柱头上的过程。
Fertilisation occurs when a pollen nucleus fuses with an ovule nucleus. This leads to seed formation. The ovary often develops into a fruit, which helps with seed dispersal.
当花粉细胞核与胚珠细胞核融合时发生受精，从而形成种子。子房通常发育成果实，有助于种子的传播。
Seeds need water, oxygen and a suitable temperature to germinate. Before the seedling can photosynthesise, it uses the food store inside the cotyledons for energy.
种子需要水、氧气和适宜的温度才能萌发。在幼苗能进行光合作用之前，它利用子叶内的营养储备来提供能量。
Plants also reproduce asexually through methods such as runners, bulbs and tubers. These produce offspring that are genetically identical to the parent, a concept you will revisit in the genetics topic.
植物也通过匍匐茎、鳞茎和块茎等方式进行无性繁殖。这些方式产生的后代在遗传上与亲本完全相同，这一概念你将在遗传学主题中再次遇到。
Learn to label a diagram of a wind-pollinated flower and an insect-pollinated flower, noting how petal size, scent and pollen quantity are adaptations to their pollination method.
学会标注风媒花和虫媒花的结构图，注意花瓣大小、气味和花粉数量如何适应其传粉方式。
10. Human Reproduction | 人类生殖
Human reproduction involves the fusion of a sperm cell (male gamete) and an egg cell (female gamete). The sperm is adapted with a streamlined head and a tail for swimming, while the egg is one of the largest human cells and contains nutrient-rich cytoplasm.
人类的生殖涉及精子（雄配子）与卵细胞（雌配子）的结合。精子适应为流线型头部和一条用于游动的尾巴，而卵子是人类最大的细胞之一，含有富含营养的细胞质。
Fertilisation usually takes place in the oviduct (fallopian tube). The resulting zygote divides many times as it travels to the uterus, where it implants into the thickened lining. This marks the beginning of pregnancy.
受精通常发生在输卵管中。由此形成的受精卵在移向子宫的过程中多次分裂，然后植入增厚的子宫内膜。这标志着妊娠的开始。
The placenta acts as a vital link: it allows oxygen, glucose and other nutrients to pass from the mother’s blood to the baby’s blood, while removing waste products such as carbon dioxide and urea. The two blood supplies remain separate.
胎盘起着至关重要的纽带作用：它让氧气、葡萄糖等营养物质从母体血液进入胎儿血液，同时清除二氧化碳和尿素等废物。两者血液并不混合。
Puberty is the stage when the body becomes capable of reproduction. Physical changes are driven by hormones: testosterone in males, oestrogen in females. Menstruation begins as part of the monthly cycle.
青春期是身体获得生殖能力的阶段。身体变化由激素驱动：男性为睾酮，女性为雌激素。月经作为每月周期的一部分开始。
Understanding the menstrual cycle (typically 28 days) and its key stages – menstruation, building of the uterine lining, ovulation – helps you connect hormone action with reproductive health.
了解月经周期（通常为28天）及其关键阶段——行经、子宫内膜增生、排卵——有助于你将激素作用与生殖健康联系起来。
11. Variation and Inheritance | 变异与遗传
No two individuals of the same species are exactly alike. Variation can be due to genetic factors, environmental factors, or a combination of both. Your height, for example, is influenced by genes and diet.
同一物种中没有两个个体是完全一样的。变异可能源自遗传因素、环境因素或者两者的结合。例如，你的身高就同时受到基因和饮食的影响。
Genes are short sections of DNA that carry the instructions for making proteins. They are located on chromosomes inside the nucleus. In humans, body cells contain 23 pairs of chromosomes.
基因是携带制造蛋白质指令的 DNA 短片段，它们位于细胞核内的染色体上。人类体细胞含有 23 对染色体。
Some characteristics are determined by a single gene with two versions called alleles. A dominant allele (e.g. B for brown eyes) will mask a recessive allele (b for blue eyes). A person with Bb has brown eyes but can pass on the recessive allele.
某些特征由单个基因决定，该基因具有两个等位基因。显性等位基因（如棕色眼睛的 B）会掩盖隐性等位基因（蓝色眼睛的 b）。基因型为 Bb 的人拥有棕色眼睛，但可以将隐性等位基因传递给后代。
Simple Punnett squares are used to predict the possible genetic make-up of offspring. Practice a monohybrid cross between two heterozygous parents (Bb × Bb) to see the 3:1 ratio of dominant to recessive phenotypes.
简单的庞纳特方格用于预测后代可能的基因组成。练习两个杂合亲本（Bb × Bb）之间的单基因杂交，观察显性与隐性表型的 3:1 比例。
Genetic disorders such as cystic fibrosis are inherited in a recessive pattern. This means that a child must inherit two faulty alleles (one from each parent) to have the condition. This topic builds a foundation for future GCSE work.
像囊性纤维化这样的遗传疾病以隐性方式遗传。这意味着孩子必须从双亲各继承一个有缺陷的等位基因才会患病。该主题为日后的 GCSE 学习打下基础。
12. Photosynthesis and Plant Nutrition | 光合作用与植物营养
Photosynthesis is the process by which green plants make glucose using light energy. The overall word equation you must know is:
光合作用是绿色植物利用光能制造葡萄糖的过程。你必须掌握的总文字方程式为：
carbon dioxide + water → glucose + oxygen
The balanced symbol equation is also frequently used. Commit it to memory using the correct subscripts:
平衡符号方程式也经常使用。请用正确的下标形式牢牢记住它：
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Chlorophyll, the green pigment housed in chloroplasts, absorbs light energy. Leaves are broad and thin to capture maximum light and allow rapid diffusion of gases. Veins carry water to the leaf and take away the glucose produced.
叶绿体的叶绿素这一绿色色素吸收光能。叶片宽大而薄，可以捕获最多的光并让气体迅速扩散。叶脉将水分输送到叶片，并将产生的葡萄糖运走。
The rate of photosynthesis is affected by light intensity, carbon dioxide concentration and temperature. A handy practical is using pondweed to measure the rate of oxygen bubble production under different light conditions.
光合作用速率受光照强度、二氧化碳浓度和温度的影响。一个实用的实验是使用水草在不同光照条件下测量氧气泡的产生速率。
Glucose made in photosynthesis is either used immediately in respiration, converted into starch for storage, or turned into cellulose for cell walls. It can also be combined with nitrates from the soil to make proteins, showing why minerals are essential for healthy growth.
光合作用制造的葡萄糖或立刻用于呼吸，或转化为淀粉储存，或转变为构成细胞壁的纤维素。它还可以与来自土壤的硝酸盐结合制造蛋白质，这表明矿物质对健康生长至关重要。
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