📚 KS3 OCR Biology: Vocabulary & Terminology Quick Memorisation Guide | 词汇术语速记指南
Mastering biology in KS3 isn’t just about remembering facts – it’s about understanding the language of life. This guide breaks down all the essential terms you need for your OCR course, from cells to ecosystems, and gives you clever memory tricks to make them stick. Whether you are preparing for a test or building a foundation for GCSE, learning vocabulary is the key that unlocks every topic.
掌握 KS3 生物不仅仅是记住事实，而是理解生命的语言。本指南为你梳理 OCR 课程中从细胞到生态系统的所有必备术语，并提供巧妙的记忆技巧助你牢牢记住。无论是备考还是为 GCSE 打基础，学习词汇都是开启每个主题的钥匙。
1. Why Biology Loves Big Words | 为什么生物偏爱复杂的词
Many biology terms come from Greek or Latin roots. Once you recognise these building blocks, long words break into familiar pieces. For example, ‘photo-‘ means light, ‘synthesis’ means putting together, so ‘photosynthesis’ literally means ‘putting together using light’. Train yourself to spot these roots and you will unlock meaning without memorising blindly.
许多生物术语源自希腊语或拉丁语词根。一旦认清了这些构件，长单词就能拆成熟悉的片段。例如 ‘photo-‘ 意为光，’synthesis’ 意为合成，所以 ‘photosynthesis’ 字面意思就是 ‘利用光来合成’。训练自己发现词根，你就能领会含义而不必死记硬背。
Common prefixes include ‘cyto-‘ (cell), ‘chloro-‘ (green), ‘endo-‘ (inside), ‘exo-‘ (outside), ‘multi-‘ (many) and ‘uni-‘ (one). Suffixes like ‘-logy’ (study of) and ‘-troph’ (nourishment) appear again and again. Making flashcards that split terms into prefix, root and suffix helps your brain build connections.
常见前缀有 ‘cyto-‘（细胞）、’chloro-‘（绿）、’endo-‘（内）、’exo-‘（外）、’multi-‘（多）和 ‘uni-‘（单）。后缀如 ‘-logy’（学科）和 ‘-troph’（营养）反复出现。制作抽认卡时将术语拆分为前缀、词根和后缀，能帮助大脑建立联结。
2. Cells and Organelles: The Tiny Factories | 细胞与细胞器：微型工厂
A cell is the smallest unit of life that can carry out all life processes. Under the microscope you will see the three main parts of an animal cell: the nucleus (control centre holding DNA), the cytoplasm (jelly-like substance where reactions happen) and the cell membrane (a selective barrier that lets substances in and out). Think of the nucleus as the head office, the cytoplasm as the factory floor and the membrane as the security gate.
细胞是能进行所有生命过程的最小生命单位。在显微镜下你能看到动物细胞的三个主要部分：细胞核（存放 DNA 的控制中心）、细胞质（发生化学反应的胶状物质）和细胞膜（选择性屏障，控制物质进出）。把细胞核想象成总部，细胞质是工厂车间，细胞膜则是安检门。
Plant cells have three extra structures: a rigid cell wall made of cellulose for support, a large permanent vacuole filled with cell sap that keeps the cell firm, and chloroplasts containing green chlorophyll for photosynthesis. The mnemonic ‘Cats Cry Very Much’ can help you remember: Cell wall, Chloroplasts, Vacuole (large), Mitochondria (both types have mitochondria, but this reminds you of plant unique features).
植物细胞额外有三种结构：由纤维素构成的坚硬细胞壁起支撑作用；一个充满细胞液的大液泡使细胞坚挺；含有叶绿素的叶绿体进行光合作用。可用 “猫大声哭” 谐音记法：Cell wall 细胞壁, Chloroplasts 叶绿体, Vacuole 液泡, Mitochondria 线粒体（两类细胞都有，但帮你记住植物特有结构）。
3. Levels of Organisation: From Simple to Complex | 组织层次：从简单到复杂
Biology builds complexity in clear steps. The hierarchy you must know is: cells → tissues → organs → organ systems → organism. A tissue is a group of similar cells working together, like muscle tissue. An organ is made of different tissues performing a specific function, such as the heart. An organ system is a group of organs that work together, for instance the digestive system.
生物的复杂性层层递进。你必须掌握的层次是：细胞 → 组织 → 器官 → 器官系统 → 生物体。组织是一群相似细胞协同工作，例如肌肉组织。器官由不同组织构成，执行特定功能，如心脏。器官系统是一组共同工作的器官，比如消化系统。
Practice this by building a human model: muscle cell → cardiac muscle tissue → heart organ → circulatory system → human organism. Always ask yourself, ‘What is it made of?’ and ‘What does it make up?’ to lock in the order. Remember that all systems are integrated – the respiratory system brings in oxygen, which the circulatory system transports, for muscle cells to use in respiration.
通过建立人体模型来练习：肌细胞 → 心肌组织 → 心脏器官 → 循环系统 → 人体（生物体）。常问自己 “它由什么组成？”和 “它构成什么？”来稳固顺序。记住所有系统都是一体的——呼吸系统摄入氧气，循环系统运输氧气，肌细胞用其进行呼吸作用。
4. MRS GREN: The Seven Life Processes | MRS GREN：七大生命过程
All living things share seven life processes, remembered by the acronym MRS GREN: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition. Movement includes the ability to change position or move substances inside the body. Respiration releases energy from food, not just breathing. Sensitivity means detecting and responding to changes in the surroundings.
所有生物共享七大生命过程，缩略词 MRS GREN 助记：Movement 运动, Respiration 呼吸作用, Sensitivity 应激性, Growth 生长, Reproduction 生殖, Excretion 排泄, Nutrition 营养。运动包括改变位置或在体内运输物质。呼吸作用是从食物中释放能量，而不仅仅是呼吸。应激性指察觉并回应环境变化。
Use this check: ‘Is it alive? Run MRS GREN!’ A car moves but does not grow or reproduce, so it fails the test. For exams, always link a life process with a real example, like plants growing towards light (sensitivity and growth) or removal of carbon dioxide during exhalation (excretion). This shows you understand, not just recall.
用这个检验：“它是活的吗？运行 MRS GREN！” 汽车能移动但不生长或繁殖，所以通不过。在考试中，务必为生命过程配上实例，如植物向光生长（应激性与生长）或呼气排出二氧化碳（排泄），显示你理解而不只是背诵。
5. Nutrition and Digestion: Breaking Down the Journey | 营养与消化：分解之旅
Nutrition means taking in and using food. Digestion is the breakdown of large insoluble molecules into small soluble ones that can be absorbed. Your digestive system is essentially a long tube – the alimentary canal – with key organs: mouth (mechanical and chemical digestion by enzymes in saliva), oesophagus (peristalsis pushes food down), stomach (acid and enzymes work on proteins), small intestine (absorption of nutrients into blood) and large intestine (absorption of water, faeces formation).
营养指摄入和利用食物。消化是将不溶的大分子分解为可吸收的小分子。你的消化系统本质上是一条长管——消化管——关键器官包括：口腔（唾液酶进行机械和化学消化）、食道（蠕动推送食物）、胃（酸和酶分解蛋白质）、小肠（营养吸收入血液）和大肠（吸收水分，形成粪便）。
Accessory organs such as the liver (produces bile) and pancreas (makes digestive enzymes and insulin) are not part of the tube but pour secretions into the small intestine. A simple mnemonic for enzyme actions: amylase breaks starch into sugar, protease breaks protein into amino acids, lipase breaks fats into fatty acids and glycerol. Think ‘All Students Plant Lovely Petals’ – Amylase/Starch, Protease/Protein, Lipase/Fats.
辅助器官如肝脏（分泌胆汁）和胰腺（制造消化酶和胰岛素）虽不在管道上，但分泌液排入小肠。一个简单的酶作用口诀：淀粉酶将淀粉分解为糖，蛋白酶将蛋白质分解为氨基酸，脂肪酶将脂肪分解为脂肪酸和甘油。可联想 ‘All Students Plant Lovely Petals’。
6. Respiration and Gas Exchange | 呼吸作用与气体交换
Do not confuse breathing with respiration! Ventilation (breathing) is the movement of air in and out of the lungs. Respiration is a chemical reaction inside cells that releases energy from glucose. The word equation for aerobic respiration is: glucose + oxygen → carbon dioxide + water (+ energy). Using symbols: C6H12O6 + 6O2 → 6CO2 + 6H2O.
切勿混淆呼吸与呼吸作用！肺通气（呼吸）是空气进出肺的活动。呼吸作用是细胞内从葡萄糖释放能量的化学反应。有氧呼吸的文字方程式为：葡萄糖 + 氧气 → 二氧化碳 + 水 (+ 能量)。符号式：C6H12O6 + 6O2 → 6CO2 + 6H2O。
Anaerobic respiration happens when oxygen is short, producing lactic acid in muscles and causing cramps. The word equation: glucose → lactic acid (+ some energy). Gas exchange occurs in the alveoli, tiny air sacs in the lungs with enormous surface area, thin walls and rich blood supply. Inhalation increases chest volume, exhalation decreases it. The diaphragm and intercostal muscles drive this process.
缺氧时发生无氧呼吸，肌肉产生乳酸导致酸痛。文字方程式：葡萄糖 → 乳酸 (+ 少量能量)。气体交换在肺泡中进行，它们是肺部微小的气囊，具有巨大表面积、薄壁和丰富的血供。吸气时胸廓容积增大，呼气时减小。膈肌和肋间肌驱动这一过程。
7. Circulation and Transport: The Body’s Delivery Service | 循环与运输：体内的递送服务
The circulatory system consists of the heart, blood vessels and blood. The heart is a double pump: the right side pumps deoxygenated blood to the lungs (pulmonary circuit), the left side pumps oxygenated blood to the body (systemic circuit). Remember the mantra: ‘Right to Lungs, Left to Body’.
循环系统由心脏、血管和血液组成。心脏是双泵：右侧泵送缺氧血至肺部（肺循环），左侧泵送富氧血至全身（体循环）。记住口诀：“右去肺，左去体”。
Three vessel types are essential: arteries carry blood away from the heart under high pressure (thick muscular walls), veins carry blood back to the heart (thinner walls, valves prevent backflow), and capillaries are microscopic vessels where exchange of gases and nutrients occurs (one cell thick walls). Think of arteries as motorways, veins as country roads with gates, and capillaries as tiny alleys for door-to-door delivery.
三种血管必须牢记：动脉将血液带离心脏，压力高，壁厚肌层发达；静脉将血液送回心脏，壁较薄，有瓣膜防倒流；毛细血管是进行物质交换的微细血管，管壁仅一层细胞厚。把动脉想象成高速路，静脉为带栅门的乡间路，毛细血管则是送货上门的小巷。
Blood contains red blood cells (carry oxygen using haemoglobin), white blood cells (fight infection), platelets (help clotting) and plasma (liquid transport medium). Each plays a vital role, just like a postman, security guard, repair crew and courier service all in one.
血液包含红细胞（用血红蛋白运输氧气）、白细胞（抵御感染）、血小板（帮助凝血）和血浆（液态运输介质）。它们各司其职，仿佛集邮递员、保安、维修队和快递员于一身。
8. Reproduction and Genetics: Passing on the Code | 生殖与遗传：传递密码
Sexual reproduction involves two parents and leads to variation because offspring inherit a mix of genes from both. Specialised sex cells (gametes) – sperm in males and eggs in females – fuse during fertilisation to form a zygote. Gametes contain half the usual number of chromosomes (haploid), so that the zygote restores the full number (diploid).
有性生殖涉及两个亲本，产生变异，因为后代从双亲各获得一半基因。特化的性细胞（配子）——雄性精子与雌性卵子——在受精过程中融合成受精卵。配子含正常染色体数目的一半（单倍体），受精后恢复全数（二倍体）。
Key genetic terms: the nucleus contains chromosomes made of DNA. A gene is a short section of DNA that codes for a characteristic. Different forms of a gene are alleles. Genotype is the combination of alleles, phenotype is what you see. Use the ‘G-P’ link: G for genes inside, P for physical appearance.
核心遗传术语：细胞核内含由DNA 构成的染色体。基因是编码性状的一段 DNA 短片段。基因的不同形式叫等位基因。基因型是等位基因的组合，表现型是可见的外在表现。用 “G 内 P 外” 来记。
Asexual reproduction needs only one parent and produces genetically identical offspring (clones). Examples include binary fission in bacteria, runners in strawberries, and tubers in potatoes. This is fast but lacks variation, making populations vulnerable if conditions change.
无性生殖只需一个亲本，产生遗传上相同的后代（克隆）。实例包括细菌的二分裂、草莓的匍匐茎和马铃薯的块茎。这种方式速度快但缺乏变异，环境变化时易使群体遭受威胁。
9. Ecology and Environment: Who Lives Where and Why | 生态与环境：谁在哪生活，为什么
Ecology is the study of living things and their interactions. A habitat is the place where an organism lives. A population is all the members of one species in a habitat. A community is all the populations living together. An ecosystem is the community plus the non-living (abiotic) factors such as light, water and temperature.
生态学研究生物及其相互作用。栖息地是生物生活的地方。种群是同一栖息地中同种的所有个体。群落是住在一起的所有种群。生态系统指群落加上非生物（光照、水分、温度等）因素。
Feeding relationships are shown in food chains and food webs. A chain starts with a producer (green plant) that makes its own food via photosynthesis, followed by primary consumer (herbivore), secondary consumer (carnivore) and sometimes a tertiary consumer. Decomposers (bacteria and fungi) break down dead material and recycle nutrients.
取食关系用食物链和食物网表示。链起始于生产者（绿色植物，通过光合作用自制食物），依次是初级消费者（食草动物）、次级消费者（食肉动物），有时还有三级消费者。分解者（细菌和真菌）分解死物，循环养分。
Energy flows along the chain, but only about 10% is passed on at each level; the rest is lost as heat or used for life processes. That is why food chains rarely have more than four or five trophic levels. A powerful exam phrase is: ‘Energy is lost at each trophic level, mainly as heat from respiration.’
能量沿链流动，但每一级仅约 10% 传递到下一级；其余以热散失或用于生命过程。因此食物链很少超过四五层营养级。一句有力的考试用语是：“能量在每一营养级损失，主要以呼吸作用释放的热散失。”
10. Photosynthesis and Plants | 光合作用与植物
Plants are autotrophs – they make their own glucose using light energy. The word equation for photosynthesis is: carbon dioxide + water → glucose + oxygen, and it happens in the chloroplasts. Sunlight energy is trapped by chlorophyll, the green pigment. You must also know the balanced symbol equation: 6CO2 + 6H2O → C6H12O6 + 6O2.
植物是自养生物——它们利用光能自己制造葡萄糖。光合作用的文字方程式：二氧化碳 + 水 → 葡萄糖 + 氧气，反应场所是叶绿体。光能被绿色色素叶绿素捕获。你还需掌握配平的符号式：6CO2 + 6H2O → C6H12O6 + 6O2。
Limiting factors affect the rate: light intensity, carbon dioxide concentration and temperature. If one factor is in short supply, it holds back the whole process no matter how much of the others there are – like a clogged pipe in a bathroom. A classic investigation is to test for starch in a leaf to prove photosynthesis has happened, because glucose is quickly turned into starch for storage.
限制因素影响速率：光照强度、二氧化碳浓度和温度。若某一因素短缺，无论其他因素多充裕，都会拖慢全过程——如同浴室一根堵住的水管。经典实验是用碘检验叶片中的淀粉，证明发生了光合作用，因为葡萄糖很快转化为淀粉储存。
Plant organs: roots anchor and absorb water/minerals, stems support and transport, leaves are the main site of photosynthesis, and flowers are for reproduction. Remember the leaf’s adaptations: broad shape (large surface area), thin structure (short diffusion pathway), stomata (gas exchange) and veins (xylem and phloem).
植物器官：根固定植株并吸收水分与矿物质，茎支撑并运输，叶是光合作用主场所，花负责生殖。记住叶的适应特征：宽阔（大表面积）、薄（短扩散路径）、气孔（气体交换）和叶脉（含木质部和韧皮部）。
11. Health and Disease: Defending the Body | 健康与疾病：保卫身体
A pathogen is a microorganism that causes disease, including viruses, bacteria, fungi and protists. Viruses are not alive and must invade living cells to reproduce. Bacteria can be killed by antibiotics, but antibiotics do not work on viruses. Vaccines contain weakened or dead pathogens that stimulate white blood cells to produce antibodies, giving you immunity.
病原体是导致疾病的微生物，包括病毒、细菌、真菌和原生生物。病毒非生命体，必须侵入活细胞才能繁殖。细菌可被抗生素杀死，但抗生素对病毒无效。疫苗含有削弱或死亡的病原体，刺激白细胞制造抗体，赋予你免疫力。
The body’s first line of defence includes skin, tears and stomach acid. The second line, non-specific immune cells such as phagocytes, engulf invaders. The third line is specific: lymphocytes produce antibodies that match the pathogen’s antigens. Memory cells remain after infection, allowing a rapid response next time. This is why you rarely get chickenpox twice.
身体第一道防线包括皮肤、眼泪和胃酸。第二道防线如吞噬细胞等非特异性免疫细胞，吞噬入侵者。第三道是特异性免疫：淋巴细胞产生与病原体抗原匹配的抗体。感染后记忆细胞存留，下次能快速应答——这就是为何你很少得两次水痘。
Lifestyle diseases such as obesity, type 2 diabetes and heart disease are linked to diet and exercise. Health is not just absence of disease; it is complete physical, mental and social well-being. Good revision always links organ systems to health – for instance, understanding how smoking damages cilia and alveoli, causing COPD and lung cancer.
生活方式疾病如肥胖、2 型糖尿病和心脏病与饮食和锻炼有关。健康不止于不生病，而是完整的生理、心理和社会适应状态。好的复习总把器官系统与健康挂钩——例如理解吸烟如何损伤纤毛和肺泡，导致慢阻肺和肺癌。
12. Memory Tricks and Exam Tactics | 记忆技巧与考试策略
Build your own biology glossary. Create a table with four columns: term, definition, root analysis and a visual analogy. For ‘mitochondria’, write ‘powerhouse of the cell’, ‘mito- (thread) + chondrion (grain)’, and draw a battery inside a factory. The act of creating images and stories makes recall automatic.
制作你自己的生物词汇表。建一个四列表格：术语、定义、词根分析和图像类比。以 “线粒体” 为例，写 “细胞的能量工厂”，词根 “线粒”，并画一个工厂里的电池。创造图像和故事的动作让回想变得自然而然。
Use mnemonics liberally. For the classification hierarchy: ‘King Penguin Could Order Flying Girls Skipping’ – Kingdom, Phylum, Class, Order, Family
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