📚 Year 10 OCR Science: Core Knowledge Summary | Year 10 OCR 科学：核心知识点梳理
Year 10 OCR Science lays the groundwork for GCSE success, covering fundamental concepts in biology, chemistry, and physics. This article summarises the core knowledge you need to master, from cells and enzymes to atomic structure and forces. Understanding these topics will help you tackle exam questions and build a solid foundation for Year 11.
Year 10 OCR 科学为GCSE的成功奠定基础，涵盖了生物学、化学和物理学的基本概念。本文梳理了需要掌握的核心知识点，从细胞和酶到原子结构和力。理解这些主题将帮助你应对考试问题，并为Year 11打下坚实基础。
1. Cell Biology | 细胞生物学
All living organisms are made of cells that can be classified as eukaryotic or prokaryotic. Eukaryotic cells, such as animal and plant cells, contain a nucleus and membrane-bound organelles. Prokaryotic cells, like bacteria, are smaller, lack a nucleus, and have a single circular strand of DNA floating in the cytoplasm. A typical animal cell includes a nucleus, cytoplasm, cell membrane, mitochondria, and ribosomes. Plant cells have all these plus a rigid cell wall, a large permanent vacuole, and chloroplasts for photosynthesis.
所有生物体均由细胞构成，细胞可分为真核细胞和原核细胞。真核细胞（如动物和植物细胞）含有细胞核和膜结合的细胞器。原核细胞（如细菌）较小，没有细胞核，只有一条环形DNA悬浮在细胞质中。典型的动物细胞包括细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞除了上述结构外，还具有坚硬的细胞壁、大液泡和进行光合作用的叶绿体。
Key organelles and their functions:
- Nucleus – controls cellular activities and stores genetic material (DNA).
- Mitochondria – site of aerobic respiration, releasing energy.
- Ribosomes – carry out protein synthesis.
- Chloroplasts (plant cells) – absorb light energy for photosynthesis.
- Permanent vacuole (plant cells) – filled with cell sap, maintains turgor pressure.
关键细胞器及其功能：
- 细胞核 – 控制细胞活动，储存遗传物质（DNA）。
- 线粒体 – 有氧呼吸的场所，释放能量。
- 核糖体 – 进行蛋白质合成。
- 叶绿体（植物细胞）– 吸收光能进行光合作用。
- 液泡（植物细胞）– 充满细胞液，维持膨压。
Microscopy is essential for studying cells. Magnification is calculated as Magnification = Eyepiece lens magnification × Objective lens magnification. To convert units: 1 mm = 1000 µm, 1 µ ope, the total magnification can be increased, but resolution remains limited to about 0.2 µm. Electron microscopes provide much higher magnification and resolution.
显微镜是研究细胞的基本工具。放大倍数计算为：放大倍数 = 目镜放大倍数 × 物镜放大倍数。单位换算：1 mm = 1000 µm，1 µm = 1000 nm。使用光学显微镜时，总放大倍数可以增大，但分辨率局限于约0.2 µm。电子显微镜则能提供更高的放大倍数和分辨率。
Cells can differentiate to become specialised. In animals, examples include sperm cells (streamlined, many mitochondria) and nerve cells (long axons). In plants, root hair cells increase surface area for absorption. Stem cells are undifferentiated cells that can divide to form any cell type; they are found in embryos (embryonic stem cells) and in some adult tissues. Meristem tissue in plants contains stem cells that can differentiate into any plant cell type throughout the life of the plant.
细胞可以分化成为特化的细胞。动物中，例如精子细胞（流线型，大量线粒体）和神经细胞（长轴突）。植物中，根毛细胞增大表面积以利吸收。干细胞是未分化的细胞，能够分裂形成任何类型的细胞；它们存在于胚胎（胚胎干细胞）和部分成体组织中。植物的分生组织含有干细胞，能在整个生命过程中分化成各种植物细胞。
Mitosis is the process of cell division producing two genetically identical daughter cells. It is used for growth, repair, and asexual reproduction. The stages (simplified) are: DNA replication, chromosomes line up, are pulled apart, and the cytoplasm divides (cytokinesis).
有丝分裂是产生两个遗传上相同的子细胞的细胞分裂过程，用于生长、修复和无性繁殖。简化的阶段为：DNA复制，染色体排列，分开，细胞质分裂（胞质分裂）。
Substances move in and out of cells by diffusion, osmosis, and active transport. Diffusion is the net movement of particles from a high to low concentration down a concentration gradient; it requires no energy. Osmosis is the diffusion of water through a partially permeable membrane from a dilute to a more concentrated solution. Active transport moves substances against the concentration gradient, requiring energy from respiration.
物质通过扩散、渗透和主动运输进出细胞。扩散是粒子沿着浓度梯度从高浓度区向低浓度区的净运动，不需要能量。渗透是水通过部分通透膜从较稀溶液向较浓溶液的扩散。主动运输逆浓度梯度运输物质，需要呼吸作用提供的能量。
2. Organisation | 组织结构
In multicellular organisms, cells are organised into tissues, organs, and organ systems. A tissue is a group of similar cells working together. An organ contains different tissues that perform a specific function. Organ systems are groups of organs that coordinate body functions.
在多细胞生物中，细胞组织成组织、器官和器官系统。组织是一群相似细胞共同工作的结构。器官由不同组织构成，执行特定功能。器官系统是协调身体功能的器官群。
The digestive system breaks down large insoluble molecules into small soluble ones for absorption. Key tissues include muscle tissue (peristalsis) and glandular tissue (enzyme secretion). Enzymes are biological catalysts that speed up reactions without being used up. The 'lock and key' model explains enzyme specificity. Factors affecting enzyme activity include temperature, pH, and substrate concentration. Amylase (produced in salivary glands and pancreas) breaks down starch into maltose. Protease (stomach, pancreas) breaks proteins into amino acids. Lipase (pancreas) digests lipids into fatty acids and glycerol. Bile (liver, stored in gall bladder) emulsifies fats and neutralises stomach acid, providing an alkaline pH for intestinal enzymes.
消化系统将大的不溶性分子分解为小的可溶性分子以便吸收。关键组织包括肌肉组织（蠕动）和腺组织（分泌酶）。酶是生物催化剂，能加速反应而自身不被消耗。“锁钥”模型解释了酶的专一性。影响酶活性的因素包括温度、pH和底物浓度。淀粉酶（唾液腺和胰腺分泌）将淀粉分解为麦芽糖。蛋白酶（胃、胰腺）将蛋白质分解为氨基酸。脂肪酶（胰腺）将脂类分解为脂肪酸和甘油。胆汁（肝脏产生，储存在胆囊）乳化脂肪并中和胃酸，为肠道酶提供碱性pH。
The circulatory system transports substances around the body. The heart is a double pump: the right side pumps blood to the lungs, the left side to the body. Arteries carry blood away from the heart under high pressure and have thick muscular walls. Veins return blood to the heart, have valves, and lower pressure. Capillaries are one-cell thick for efficient exchange. Blood consists of red blood cells (carry oxygen using haemoglobin), white blood cells (fight infection), platelets (clotting), and plasma (transports dissolved substances).
循环系统将物质运输至全身。心脏是一个双泵：右心将血液泵向肺部，左心泵向全身。动脉将血液带离心脏，处于高压，管壁肌肉厚实。静脉将血液送回心脏，具有瓣膜，压力较低。毛细血管仅有一层细胞厚，便于物质交换。血液由红细胞（利用血红蛋白携带氧气）、白细胞（抵抗感染）、血小板（凝血）和血浆（运输溶解物质）组成。
In plants, organisation involves tissues such as epidermal tissue, palisade mesophyll (photosynthesis), spongy mesophyll (gas exchange), xylem (transports water and minerals), and phloem (transports sugars). The leaf is adapted for photosynthesis with a large surface area, thin shape, and stomata for gas exchange. Transpiration is the evaporation of water from leaf surfaces, driven by the water column in xylem. Factors such as light intensity, temperature, air flow, and humidity affect transpiration rate.
植物的组织结构包括表皮组织、栅栏组织（光合作用）、海绵组织（气体交换）、木质部（运输水和矿物质）和韧皮部（运输糖类）。叶片适应光合作用，具有大表面积、薄的形态和气孔进行气体交换。蒸腾作用是水分从叶面蒸发的过程，由木质部的水柱驱动。光照强度、温度、气流和湿度等因素影响蒸腾速率。
3. Infection and Response | 感染与反应
Pathogens are microorganisms that cause infectious disease. The main types are viruses (e.g., measles, HIV, tobacco mosaic virus), bacteria (e.g., Salmonella, gonorrhoea), fungi (e.g., rose black spot), and protists (e.g., malaria). They can be spread by direct contact, water, air, or vectors.
病原体是引起传染病的微生物。主要类型有病毒（如麻疹、HIV、烟草花叶病毒）、细菌（如沙门氏菌、淋病）、真菌（如玫瑰黑斑病）和原生生物（如疟疾）。它们可通过直接接触、水、空气或媒介传播。
The human body has non-specific defence systems: skin acts as a barrier, nose hairs and mucus trap particles, the trachea and bronchi secrete mucus moved by cilia, and stomach produces hydrochloric acid to kill ingested pathogens. The specific immune system involves white blood cells: phagocytes engulf and digest pathogens (phagocytosis), while lymphocytes produce antibodies that bind to specific antigens on pathogens. Antitoxins neutralise toxins released by bacteria.
人体具有非特异性防御系统：皮肤作为屏障，鼻毛和粘液捕捉颗粒，气管和支气管分泌粘液由纤毛摆动清除，胃产生盐酸杀死摄入的病原体。特异性免疫系统涉及白细胞：吞噬细胞吞噬并消化病原体（吞噬作用），而淋巴细胞产生抗体，与病原体上的特定抗原结合。抗毒素中和细菌释放的毒素。
Vaccination introduces a harmless form of a pathogen containing antigens, stimulating lymphocytes to produce memory cells and antibodies. If the real pathogen enters later, the response is rapid and strong. Antibiotics, such as penicillin, kill bacteria but are ineffective against viruses. Overuse of antibiotics has led to the rise of antibiotic-resistant strains like MRSA.
疫苗接种引入含有抗原的无害病原体形式，刺激淋巴细胞产生记忆细胞和抗体。若真正的病原体随后进入，反应会迅速而强烈。抗生素（如青霉素）能杀死细菌，但对病毒无效。抗生素的滥用已导致耐药菌株（如MRSA）的出现。
Drugs are developed through testing for efficacy, toxicity, and dosage. Preclinical trials use cells and animals; clinical trials involve healthy volunteers and patients, often using double-blind and placebo methods. Painkillers (e.g., aspirin) alleviate symptoms but do not kill pathogens.
药物的研发需经过有效性、毒性和剂量的测试。临床前试验使用细胞和动物；临床试验涉及健康志愿者和患者，常采用双盲和安慰剂方法。止痛药（如阿司匹林）缓解症状但不能杀死病原体。
4. Bioenergetics | 生物能学
l word equation is: carbon dioxide + water → glucose + oxygen, and the symbol equation is: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. It is an endothermic reaction occurring in chloroplasts. Glucose is used for respiration, converted to starch for storage, or used to make cellulose and amino acids (with nitrate ions).
光合作用是植物和藻类利用光能，从二氧化碳和水产生葡萄糖和氧气的过程。总文字方程式为：二氧化碳 + 水 → 葡萄糖 + 氧气，化学方程式为：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。这是一个发生在叶绿体中的吸热反应。葡萄糖用于呼吸作用，转化为淀粉储存，或用于制造纤维素和氨基酸（需硝酸根离子）。
The rate of photosynthesis is affected by light intensity, carbon dioxide concentration, and temperature. As light intensity increases, the rate increases until another factor becomes limiting. On a graph, a plateau indicates a limiting factor. Experiments often use pondweed and count bubbles of oxygen produced to measure the rate.
光合作用速率受光照强度、二氧化碳浓度和温度的影响。光照强度增加时，速率加快，直至另一因素成为限制因子。在图表上，平台区表示存在限制因子。实验常使用水藻，通过计数产生的氧气气泡来测定速率。
Respiration is the process by which cells release energy from glucose. Aerobic respiration requires oxygen and produces a large amount of energy: glucose + oxygen → carbon dioxide + water (C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O). Anaerobic respiration occurs without oxygen and produces much less energy. In animals, it yields lactic acid: glucose → lactic acid. In plants and yeast, it produces ethanol and carbon dioxide: glucose → ethanol + carbon dioxide, a process known as fermentation. During vigorous exercise, muscles respire anaerobically, causing an oxygen debt that must be repaid by breathing heavily to oxidise lactic acid.
呼吸作用是细胞从葡萄糖释放能量的过程。有氧呼吸需要氧气，产生大量能量：葡萄糖 + 氧气 → 二氧化碳 + 水（C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O）。无氧呼吸在无氧时发生，能量产量少得多。动物体内产生乳酸：葡萄糖 → 乳酸。植物和酵母中产生乙醇和二氧化碳：葡萄糖 → 乙醇 + 二氧化碳，该过程称为发酵。剧烈运动时肌肉进行无氧呼吸，产生氧债，必须通过剧烈呼吸将乳酸氧化来偿还。
Metabolism is the sum of all reactions in the body, including the synthesis of new molecules and the breakdown of others. Key examples are the conversion of glucose to glycogen, the formation of lipids from glycerol and three fatty acids, and the use of amino acids to build proteins.
新陈代谢是体内所有反应的总和，包括新分子的合成和其他分子的分解。关键例子有葡萄糖转化为糖原、甘油和三个脂肪酸合成脂类，以及利用氨基酸构建蛋白质。
5. Atomic Structure and the Periodic Table | 原子结构与周期表
Atoms consist of a central nucleus containing protons (positive charge, relative mass 1) and neutrons (no charge, relative mass 1), surrounded by electrons (negative charge, relative mass 1/1835) in energy levels. Atomic number is the number of protons, which defines the element. Mass number is the total of protons and neutrons. Isotopes are atoms of the same element with different numbers of neutrons but the same number of protons.
原子由中心的原子核（包含质子（正电，相对质量1）和中子（无电荷，相对质量1））以及按能级排列的电子（负电，相对质量1/1835）组成。原子序数是质子数，决定了元素的种类。质量数是质子数和中子数之和。同位素是质子数相同而中子数不同的同种元素的原子。
Electrons fill shells following the rule 2, 8, 8 for the first 20 elements. The electronic configuration determines chemical properties. Elements in the same group of the periodic table have the same number of outer electrons and similar reactions. The periodic table is arranged by increasing atomic number. Metals are on the left and centre, non-metals on the right. Group 1 (alkali metals) are very reactive, low density, and react vigorously with water to form alkaline hydroxides and hydrogen. Group 7 (halogens) are non-metals that form diatomic molecules; reactivity decreases down the group. Group 0 (noble gases) are inert because they have full outer shells.
电子按2，8，8规则填充前20号元素的电子层。电子排布决定了化学性质。周期表中同一族的元素具有相同的最外层电子数，化学反应相似。周期表按原子序数递增排列。金属位于左侧和中央，非金属在右侧。第1族（碱金属）非常活泼，密度小，与水剧烈反应生成碱性氢氧化物和氢气。第7族（卤素）是非金属，形成双原子分子；活泼性向下递减。第0族（稀有气体）惰性，因其最外层电子已满。
Transition metals (central block) are typical metals: hard, high melting points, form coloured compounds, and act as catalysts. The development of the periodic table involved Mendeleev, who left gaps for undiscovered elements and predicted their properties.
过渡金属（中央区）是典型金属：坚硬、高熔点、形成有色化合物，可作为催化剂。周期表的发展中门捷列夫留下了空位，预测了未发现元素的性质。
6. Bonding, Structure, and Properties | 键合、结构与性质
Ionic bonding occurs between metals and non-metals. Metals lose electrons to form positive ions (cations), non-metals gain electrons to form negative ions (anions). The strong electrostatic attraction between opposite charges holds the ions in a giant ionic lattice. Ionic compounds have high melting/boiling points, and they conduct electricity when molten or in solution because ions are free to move. The formula of an ionic compound shows the ratio of ions, e.g., NaCl (Na⁺ and Cl⁻) and MgO (Mg²⁺ and O²⁻).
离子键形成于金属和非金属之间。金属失电子形成正离子（阳离子），非金属得电子形成负离子（阴离子）。相反电荷间强烈的静电吸引力将离子固定在巨型离子晶格中。离子化合物熔沸点高，在熔融态或溶液中能导电，因为离子可以自由移动。离子化合物的化学式表示离子比例，如NaCl（Na⁺和Cl⁻）和MgO（Mg²⁺和O²⁻）。
Covalent bonding occurs between non-metal atoms that share pairs of electrons to achieve a full outer shell. Simple molecular substances (e.g., H₂O, CO₂, CH₄) have strong covalent bonds within molecules but weak intermolecular forces, leading to low melting/boiling points. They do not conduct electricity. Giant covalent structures (e.g., diamond, graphite, silicon dioxide) have networks of strong covalent bonds, giving high melting points. Diamond is hard, each carbon bonded to four others. Graphite has layers of carbon each bonded to three, with delocalised electrons between layers, allowing it to conduct electricity and act as a lubricant.
共价键非金属原子间通过共用电子对实现满壳层。简单分子物质（如H₂O、CO₂、CH₄）分子内有强共价键，但分子间作用力弱，导致熔沸点低，不导电。巨型共价结构（如金刚石、石墨、二氧化硅）具有强共价键网络，熔沸点高。金刚石很硬，每个碳与四个碳成键。石墨碳层中每个碳与三个碳成键，层间有离域电子，可导电并作润滑剂。
Metallic bonding involves a lattice of positive ions surrounded by a 'sea' of delocalised electrons. This explains why metals conduct heat and electricity, are malleable and ductile. Alloys are mixtures of metals with other elements, disrupting the regular layers and making them harder than pure metals.
金属键涉及正离子晶格被“电子海”包围。这解释了金属能导热导电、有延展性的原因。合金是金属与其他元素的混合物，打乱了规则的层状结构，使其比纯金属更硬。
Nanoparticles are particles between 1 and 100 nm in size, with a high surface area to volume ratio. They have applications in medicine, electronics, and cosmetics, but potential risks are still being evaluated.
纳米粒子是尺寸在1至100纳米之间的颗粒，具有高表面积体积比，应用于医学、电子和化妆品，但潜在风险仍在评估中。
7. Chemical Changes | 化学反应
Chemical equations use symbols
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