📚 KS3 CIE Biology: Quick Memorisation Guide to Key Terms | KS3 CIE 生物：关键术语速记指南
Biology at Key Stage 3 introduces a whole new language. From the structures inside a cell to the processes that keep organisms alive, mastering terminology is essential for success in CIE Checkpoint and beyond. This guide breaks down the most important terms into logical groups, offers simple memory tips, and provides clear definitions in both English and Chinese so you can learn faster and remember longer.
KS3 阶段的生物课为你打开了一门全新的语言。从细胞内部的结构到维持生物体存活的过程，掌握术语对于 CIE Checkpoint 考试以及后续学习都至关重要。本指南将最重要的词汇按逻辑分组，提供简单的记忆技巧，并有清晰的中英文定义，帮助学得更快、记得更牢。
1. Life Processes: MRS GREN | 生命活动：MRS GREN 口诀
All living organisms share seven life processes. Remember the acronym MRS GREN: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition. Each of these processes is a clue that something is alive, even if it doesn't move like an animal.
所有生物共有七大生命活动。记住缩略词 MRS GREN：运动 (Movement)、呼吸 (Respiration)、感应 (Sensitivity)、生长 (Growth)、生殖 (Reproduction)、排泄 (Excretion)、营养 (Nutrition)。每一个过程都是判断物体是否具有生命的线索，即使它不会像动物那样移动。
Sensitivity means detecting and responding to changes in the environment. For example, a plant bending toward light is showing sensitivity. Respiration is the chemical process of releasing energy from food, not just breathing. Excretion is removing the waste products of metabolism, such as urea and carbon dioxide, which is different from egestion (removing undigested food).
感应 (Sensitivity) 是指探测环境变化并作出反应，例如植物向光弯曲就表现了感应。呼吸 (Respiration) 是从食物中释放能量的化学过程，而不仅仅是喘气。排泄 (Excretion) 是清除代谢产生的废物，如尿素和二氧化碳，它与排遗 (egestion，排出未消化的食物) 不同。
2. Cell Structure: The Building Blocks | 细胞结构：生命的积木
The cell is the basic unit of life. Animal cells contain a nucleus, cytoplasm, cell membrane, and mitochondria. Plant cells have these plus a rigid cell wall, a large permanent vacuole, and chloroplasts. Linking the name to the job helps: 'nucleus' sounds like 'nucleus' of a team – it controls the cell.
细胞是生命的基本单位。动物细胞包含细胞核、细胞质、细胞膜和线粒体。植物细胞除了这些，还有坚硬的细胞壁、一个巨大的中央液泡和叶绿体。把名字和功能联系起来有助于记忆：'nucleus'（细胞核）像个团队的核心——它控制细胞的活动。
The cytoplasm is a jelly-like substance where chemical reactions happen. Mitochondria are the powerhouses, where respiration takes place. The cell membrane controls what enters and leaves. In plant cells, chloroplasts absorb light for photosynthesis, and the vacuole stores cell sap, helping keep the cell firm. Remember: only plant cells have chloroplasts, not all green organisms are plants, but all plants have them.
细胞质是进行化学反应的胶状物质。线粒体是能量的工厂，是进行呼吸作用的地方。细胞膜控制物质的进出。在植物细胞中，叶绿体吸收光能用于光合作用，液泡则储存细胞液并帮助细胞保持坚挺。记住：只有植物细胞有叶绿体，不是所有绿色生物都是植物，但所有植物都有叶绿体。
3. Levels of Organisation | 组织层次
In multicellular organisms, cells don' m tissues, tissues form organs, and organs work together in organ systems. A handy phrase: 'Cells Team Up to Play Games' – Cells → Tissues → Organs → Organ Systems → Organism.
在多细胞生物中，细胞并不单独工作。它们组合成组织，组织形成器官，器官再组成器官系统。一个顺口溜：细胞组队玩游戏 (Cells Team Up to Play Games) —— 细胞 (Cells) → 组织 (Tissues) → 器官 (Organs) → 器官系统 (Organ Systems) → 生物体 (Organism)。
For example, muscle cells form muscle tissue, which makes up the heart (an organ). The heart is part of the circulatory system. The stomach is an organ made of muscle tissue, glandular tissue, and epithelial tissue. Knowing this hierarchy will help you understand how the body functions as a whole in both humans and plants.
例如，肌细胞构成肌肉组织，肌肉组织构成心脏（一个器官）。心脏又是循环系统的一部分。胃是由肌肉组织、腺体组织和上皮组织构成的器官。理解这个层次结构，有助于你从整体上把握人体和植物如何运作。
4. Movement In and Out of Cells | 物质进出细胞
Substances move across cell membranes by diffusion, osmosis, and active transport. Diffusion is the net movement of particles from a region of high concentration to low concentration, down a concentration gradient. Think of a drop of ink spreading in water. Osmosis is simply the diffusion of water molecules across a partially permeable membrane.
物质通过扩散、渗透和主动运输穿过细胞膜。扩散是粒子从高浓度区域向低浓度区域的净移动，沿着浓度梯度进行。想象一滴墨水在水中散开。渗透其实就是水分子通过选择透过性膜的扩散。
Active transport is different: it moves substances against the concentration gradient (from low to high concentration) and requires energy from respiration. Root hair cells in plants use active transport to absorb mineral ions from the soil, where their concentration is lower than inside the cell. Remember: diffusion and osmosis are passive, no energy needed.
主动运输则不同：它逆浓度梯度移动物质（从低浓度到高浓度），需要呼吸作用提供的能量。植物的根毛细胞利用主动运输从土壤中吸收矿物质离子，即使土壤中的离子浓度比细胞内低。记住：扩散和渗透是被动过程，不需要能量。
5. Enzymes: Speeding Up Reactions | 酶：加速化学反应
Enzymes are biological catalysts made of protein. They speed up chemical reactions in living organisms without being used up themselves. The 'lock and key' model is the classic way to understand how enzymes work: the substrate fits into the enzyme's active site like a key in a lock.
酶是由蛋白质构成的生物催化剂。它们能加速生物体内的化学反应，自身却不会被消耗。'锁钥模型'是理解酶工作原理的经典方式：底物就像一把钥匙插入酶的活性位点（锁）中。
Enzymes are specific – each enzyme only works on one particular substrate. They are affected by temperature and pH. High temperatures can denature the enzyme, changing the shape of the active site permanently so the substrate no longer fits. In humans, enzymes work best at around 37°C and a pH near neutral (7), but stomach enzymes work in very acidic conditions.
酶具有专一性——每种酶只作用于一种特定的底物。它们受温度和 pH 值的影响。高温会使酶变性，永久改变活性部位的形状，使底物不再能匹配。人体酶在约 37°C 和接近中性 (pH 7) 时活性最佳，但胃里的酶在强酸性环境中工作。
6. Nutrition and Digestion | 营养与消化
Nutrition is how organisms obtain food. Autotrophs make their own food (e.g., plants via photosynthesis), while heterotrophs must consume organic matter. Digestion breaks down large, insoluble food molecules into smaller, soluble ones that can be absorbed into the blood.
营养是生物获取食物的方式。自养生物（如植物通过光合作用）自己制造食物，而异养生物必须摄取有机物。消化将大分子不溶性食物分解为可溶的小分子，以便被血液吸收。
Key words include mechanical digestion (chewing in the mouth, churning in the stomach) and chemical digestion (by enzymes). Carbohydrases break down carbohydrates into simple sugars; proteases break proteins into amino acids; lipases break fats into fatty acids and glycerol. Absorption mainly happens in the small intestine, through tiny finger-like villi.
关键词包括机械性消化（口腔咀嚼、胃部搅拌）和化学性消化（由酶完成）。碳水化合物酶将碳水化合物分解为简单糖类；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。吸收主要发生在小肠，通过微小的指状突起——绒毛进行。
7. The Respiratory and Circulatory Systems | 呼吸系统与循环系统
When we say 'respiration' in biology, we mean the release of energy inside cells, not just breathing. The respiratory system brings oxygen into the body and removes carbon dioxide. The circulatory system transports these gases, along with nutrients and waste, around the body.
在生物学中，说到'呼吸 (respiration)'，我们指的是细胞内部释放能量的过程，而不仅仅是喘气。呼吸系统将氧气带入体内并排出二氧化碳。循环系统则负责将这些气体，连同营养物质和废物，运送至全身各处。
The heart pumps blood through arteries (away from the heart), veins (back to the heart), and capillaries (where exchange happens). Red blood cells contain haemoglobin, which carries oxygen. Plasma transports carbon dioxide, glucose, and urea. The lungs have millions of alveoli to provide a large surface area for gas exchange by diffusion.
心脏泵出血液，流经动脉（离开心脏）、静脉（回到心脏）和毛细血管（交换场所）。红细胞含有血红蛋白，负责携带氧气。血浆运输二氧化碳、葡萄糖和尿素。肺部拥有数以百万计的肺泡，为扩散方式的气体交换提供了巨大的表面积。
8. Photosynthesis: Plants as Producers | 光合作用：植物是生产者
nce of light and chlorophyll. The balanced symbol equation is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
光合作用是绿色植物制造自己食物的方式。文字方程式总结了整个过程：二氧化碳 + 水 → 葡萄糖 + 氧气，需要光和叶绿素。平衡的符号方程式为 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。
Chlorophyll, inside chloroplasts, absorbs light energy to drive the reaction. Leaves have adaptations: large surface area, thin shape for diffusion, veins to transport water and glucose, and stomata for gas exchange. Limiting factors for photosynthesis include light intensity, carbon dioxide concentration, and temperature.
叶绿体内的叶绿素吸收光能驱动这个反应。叶片有很多适应特征：大表面积、薄片状便于扩散、叶脉运输水和葡萄糖、气孔进行气体交换。光合作用的限制因素包括光照强度、二氧化碳浓度和温度。
9. Ecosystems and Interdependence | 生态系统与相互依存
An ecosystem includes all the living organisms (biotic factors) and non-living components (abiotic factors) like water, soil, and temperature, in a given area. Interdependence means organisms depend on each other for food, shelter, and other resources. Food chains and food webs show feeding relationships.
生态系统包括特定区域内的所有生物（生物因素）和非生物组分（非生物因素），如水、土壤和温度。相互依存指生物为获取食物、住所和其他资源而相互依赖。食物链和食物网展示了捕食关系。
Producers are always at the start (plants). Primary consumers eat producers, secondary consumers eat primary consumers. A predator kills and eats prey. Decomposers like bacteria and fungi break down dead matter, recycling nutrients back into the soil. Remember: arrows in a food chain point from the eaten to the eater, showing the flow of energy.
生产者总是处于起点（植物）。初级消费者吃生产者，次级消费者吃初级消费者。捕食者杀死并吃掉猎物。分解者如细菌和真菌分解死去的物质，将养分重新循环到土壤中。记住：食物链中的箭头从被吃者指向吃者，表示能量的流动方向。
10. Reproduction: Ensuring Survival | 生殖：确保物种延续
Reproduction can be sexual (involving two parents, producing genetic variation) or asexual (one parent, producing identical offspring). In humans, the male sex cell is sperm, produced in testes; the female sex cell is the egg (ovum), produced in ovaries. Fertilisation is the fusion of their nuclei.
生殖可分为有性生殖（涉及双亲，产生遗传变异）和无性生殖（只有单亲，产生完全相同的后代）。在人类中，雄性生殖细胞是精子，在睾丸中产生；雌性生殖细胞是卵子，在卵巢中产生。受精就是它们的核融合。
In plants, pollination is the transfer of pollen from the anther to the stigma. Then fertilisation leads to seed and fruit formation. Seeds need warmth, water, and oxygen to germinate. Asexual reproduction in plants includes runners (strawberries) and tubers (potatoes).
植物中，传粉是花粉从花药传到柱头的过程。随后受精导致种子和果实的形成。种子萌发需要温暖、水和氧气。植物的无性生殖包括匍匐茎（草莓）和块茎（土豆）方式。
11. Variation and Inheritance | 变异与遗传
Variation is the differences between individuals of the same species. It can be caused by genes (inherited) and the environment. Continuous variation (e.g., height) shows a range, while discontinuous variation (e.g., blood group) shows distinct groups. Genes are sections of DNA that code for specific proteins.
变异是同一物种个体之间的差异。可由基因（遗传）和环境造成。连续变异（如身高）呈现一个范围，而非连续变异（如血型）呈现明显的分组。基因是编码特定蛋白质的 DNA 片段。
DNA is a double helix, and chromosomes are long coiled-up DNA molecules found in the nucleus. Humans have 23 pairs. A species is a group of organisms that can interbreed to produce fertile offspring. Remember: a dominant allele is shown by a capital letter, recessive by a lower case letter.
DNA 是双螺旋结构，染色体是细胞核内长而卷曲的 DNA 分子。人类有 23 对染色体。物种是一组能够互相交配并产生可育后代的生物。记住：显性等位基因用大写字母表示，隐性等位基因用小写字母表示。
12. Quick Memory Blitz: Visual Flashcards | 快速记忆突击：视觉闪卡
The best way to master these terms is to convert them into mini stories or pictures. For instance, imagine 'haemoglobin' as a red taxi picking up oxygen passengers in the lungs. For 'stomata', picture little mouths on a leaf opening and closing. Linking a term to a vivid mental image uses more parts of your brain and drastically boosts recall.
掌握这些术语的最佳方式是将其转化为微型故事或图像。例如，把 'haemoglobin'（血红蛋白）想象成一辆红色出租车，在肺部接上氧气乘客。对于 'stomata'（气孔），想象叶片上张开又闭合的小嘴巴。将术语与生动的心理图像联系起来，能够动用大脑更多区域，极大地提高记忆效果。
Combine this with daily recall practice: write the term on one side of a card, and the definition plus the Chinese meaning on the other. Test yourself actively. Saying the word aloud while looking at the image strengthens neural pathways. Before you know it, you'll be thinking like a biologist!
结合每日回忆练习：在卡片一面写上术语，另一面写下定义和中文意思。主动地自我测试。一边看图一边大声念出单词，可以强化神经通路。不知不觉中，你就能像生物学家一样思考！
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