📚 Year 10 OCR Biology: Core Knowledge Summary | Year 10 OCR 生物：核心知识点梳理
Mastering Year 10 OCR Biology requires a solid understanding of the fundamental topics that underpin the entire GCSE course. This article consolidates the essential knowledge across cell biology, organisation, bioenergetics, ecology, evolution and genetics. Use this as a checklist and quick-reference guide to boost your confidence and exam readiness.
掌握 Year 10 OCR 生物，需要牢固理解支撑整个 GCSE 课程的基础主题。本文整理了细胞生物学、组织层次、生物能量学、生态学、进化和遗传学等核心知识点，可作为复习清单和速查指南，帮助你提升信心，做好考试准备。
1. Cell Structure and Microscopy | 细胞结构与显微镜
All living organisms are composed of cells. Eukaryotic cells, such as animal and plant cells, contain membrane-bound organelles. The nucleus stores DNA, the cytoplasm is the site of chemical reactions, the cell membrane controls what enters and leaves, mitochondria carry out aerobic respiration, and ribosomes synthesise proteins. In plant cells, a rigid cell wall made of cellulose provides support, a permanent vacuole contains cell sap, and chloroplasts are the site of photosynthesis.
所有生物体都由细胞构成。动物和植物细胞等真核细胞含有膜包围的细胞器。细胞核储存 DNA，细胞质是化学反应发生的场所，细胞膜控制物质进出，线粒体进行有氧呼吸，核糖体合成蛋白质。在植物细胞中，由纤维素构成的细胞壁提供支持，中央大液泡含有细胞液，叶绿体是光合作用的场所。
| Structure | Animal Cell | Plant Cell |
|---|---|---|
| Nucleus | ✓ | ✓ |
| Cytoplasm | ✓ | ✓ |
| Cell membrane | ✓ | ✓ |
| Mitochondria | ✓ | ✓ |
| Ribosomes | ✓ | ✓ |
| Cell wall | ✗ | ✓ (cellulose) |
| Chloroplasts | ✗ | ✓ |
| Permanent vacuole | ✗ | ✓ (large, central) |
Light microscopes use lenses and light to magnify specimens. Stains such as iodine (for plant cells) or methylene blue (for animal cells) help make organelles visible. The total magnification is calculated by multiplying the eyepiece lens magnification by the objective lens magnification.
光学显微镜利用透镜和光线放大标本。用碘液（染植物细胞）或亚甲基蓝（染动物细胞）染色可使细胞器更易观察。总放大倍数等于目镜放大倍数乘以物镜放大倍数。
Total Magnification = Eyepiece Magnification × Objective Magnification
/ magnification. Remember to convert all units to the same scale, typically micrometres (µm) or millimetres.
计算显微镜下物体的实际大小时，使用公式：实际大小 = 图像大小 / 放大倍数。记得将所有单位统一，通常使用微米 (µm) 或毫米。
2. Cell Division and Stem Cells | 细胞分裂与干细胞
The cell cycle consists of interphase (DNA replication and growth), mitosis (nucleus division) and cytokinesis (cytoplasm splitting). Mitosis produces two genetically identical daughter cells and is used for growth, repair and asexual reproduction. During mitosis, chromosomes line up at the centre of the cell and are pulled apart by spindle fibres.
细胞周期包括间期（DNA 复制和生长）、有丝分裂（细胞核分裂）和胞质分裂（细胞质分离）。有丝分裂产生两个遗传上相同的子细胞，用于生长、修复和无性生殖。在有丝分裂过程中，染色体排列在细胞中央，并由纺锤丝牵引分开。
Stem cells are unspecialised cells that can differentiate into various cell types. Embryonic stem cells are pluripotent and can form any cell type, while adult stem cells (e.g. in bone marrow) are multipotent. In plants, meristematic tissue contains stem cells throughout the plant's life, enabling continuous growth.
干细胞是未特化的细胞，能够分化为多种细胞类型。胚胎干细胞具有多能性，可形成任何细胞类型；成体干细胞（如骨髓中的干细胞）则为多能性。植物分生组织在整个生命周期中都含有干细胞，从而能不断生长。
The use of embryonic stem cells raises ethical dilemmas because extracting them destroys the early embryo. However, adult stem cells and plant meristems offer ethically acceptable alternatives for research and therapies.
胚胎干细胞的使用涉及伦理困境，因为提取它们会破坏早期胚胎。不过，成体干细胞和植物分生组织为研究和治疗提供了伦理上可接受的替代方案。
3. Biological Molecules and Enzymes | 生物分子与酶
Carbohydrates, proteins and lipids are the main biological molecules. Carbohydrates, such as glucose and starch, provide energy; proteins, built from amino acids, are essential for growth and repair; lipids (fats and oils) provide insulation and long-term energy storage. Each can be identified using specific food tests.
碳水化合物、蛋白质和脂质是主要的生物分子。葡萄糖和淀粉等碳水化合物提供能量；由氨基酸构成的蛋白质对生长和修复至关重要；脂质（脂肪和油）提供保温和长期能量储存。每种物质都可以通过特定食物测试来鉴定。
Benedict's test: reducing sugars turn blue solution to brick red upon heating.
本尼迪克特试验：还原糖在加热时使蓝色溶液变为砖红色。
Iodine test: starch turns iodine solution from yellow-brown to blue-black.
碘液试验：淀粉使碘液由黄褐色变为蓝黑色。
Biuret test: proteins turn blue biuret reagent to purple.
双缩脲试验：蛋白质使蓝色双缩脲试剂变为紫色。
Ethanol emulsion test: lipids produce a cloudy white emulsion when mixed with ethanol and water.
乙醇乳液试验：脂质与乙醇和水混合时产生乳白色浑浊。
Enzymes are protein catalysts that speed up metabolic reactions without being used up. Each enzyme has a precisely shaped active site that binds to a specific substrate, explained by the lock-and-key model. Enzyme activity is influenced by temperature and pH; extreme conditions denature the enzyme, changing the active site shape and preventing binding.
酶是蛋白质催化剂，能加速代谢反应而自身不被消耗。每种酶都有一个形状精确的活性部位，与特定底物结合，这可用锁钥模型来解释。酶的活性受温度和 pH 影响；极端条件会使酶变性，改变活性部位的形状，从而阻止底物结合。
Substrate + Enzyme → Enzyme-Substrate Complex → Product + Enzyme (unchanged)
底物 + 酶 → 酶-底物复合物 → 产物 + 酶（不变）
4. Digestive System and Nutrients | 消化系统与营养
The human digestive system is a muscular tube that breaks down large, insoluble molecules into small, soluble ones that can be absorbed into the blood. Food passes through the mouth, oesophagus, stomach, small intestine, large intestine, rectum and anus. The liver, gall bladder and pancreas are accessory organs that produce digestive secretions.
人类消化系统是一根肌肉质管道，将大分子不溶性物质分解为可吸收进入血液的小分子可溶性物质。食物依次经过口腔、食道、胃、小肠、大肠、直肠和肛门。肝脏、胆囊和胰腺是产生消化液的附属器官。
Amylase (produced in salivary glands and pancreas) breaks down starch into maltose.
淀粉酶（由唾液腺和胰腺分泌）将淀粉分解为麦芽糖。
Protease (stomach, pancreas) breaks proteins into amino acids.
蛋白酶（胃、胰腺）将蛋白质分解为氨基酸。
Lipase (pancreas) breaks lipids into fatty acids and glycerol. Bile, produced by the liver and stored in the gall bladder, emulsifies fats to increase the surface area for lipase action.
脂肪酶（胰腺）将脂质分解为脂肪酸和甘油。由肝脏产生、储存在胆囊的胆汁能乳化脂肪，增大脂肪酶作用的表面积。
The small intestine is lined with villi, which provide a vast surface area for absorption. Each villus contains a network of blood capillaries and a lacteal to transport absorbed nutrients away quickly.
小肠内壁布满绒毛，提供了巨大的吸收表面积。每根绒毛内含有毛细血管网和一根乳糜管，能迅速将吸收的营养物质运走。
5. Circulatory System and Blood | 循环系统与血液
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 circulation), while the left side pumps oxygenated blood to the rest of the body (systemic circulation). Valves prevent backflow of blood.
循环系统由心脏、血管和血液组成。心脏是一个双泵：右侧将缺氧血泵入肺部（肺循环），左侧将富氧血泵送到全身（体循环）。瓣膜防止血液倒流。
Arteries carry blood away from the heart under high pressure and have thick, elastic muscular walls. Veins return blood to the heart at lower pressure and contain valves. Capillaries are one-cell-thick vessels where exchange of gases, nutrients and waste occurs.
动脉将血液在高压下带离心脏，管壁厚且有弹性肌肉层。静脉在较低压力下将血液送回心脏，含有瓣膜。毛细血管是仅有一个细胞厚的血管，是气体、营养物质和废物交换的场所。
Blood consists of four main components: red blood cells (no nucleus, biconcave discs that carry oxygen bound to haemoglobin), white blood cells (part of the immune system, fighting pathogens), platelets (fragments involved in clotting) and plasma (the liquid transport medium carrying dissolved substances).
血液由四种主要成分组成：红细胞（无细胞核，双凹圆盘状，通过血红蛋白携带氧气）、白细胞（参与免疫防御，对抗病原体）、血小板（参与凝血的细胞碎片）和血浆（运载溶解物质的液体介质）。
6. Respiratory System and Gas Exchange | 呼吸系统与气体交换
Ventilation moves air into and out of the lungs. Gas exchange occurs in the alveoli: tiny air sacs with a large surface area, thin walls (one cell thick) and a rich capillary network. Oxygen diffuses from the alveolar air into the blood, while carbon dioxide diffuses in the opposite direction down its concentration gradient.
通气使空气进出肺部。气体交换发生在肺泡——微小的气囊，具有巨大的表面积、极薄的壁（仅一个细胞厚）和丰富的毛细血管网。氧气从肺泡腔顺浓度梯度扩散进入血液，而二氧化碳则沿相反方向扩散。
Aerobic respiration is the complete breakdown of glucose using oxygen, releasing a large amount of energy. The overall word equation and symbol equation should be memorised.
有氧呼吸是利用氧气彻底分解葡萄糖，释放大量能量的过程。应牢记其文字方程和符号方程。
Glucose + Oxygen → Carbon Dioxide + Water (+ energy)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Anaerobic respiration occurs when oxygen is insufficient. In animal muscle cells it produces lactic acid, causing fatigue. In yeast and plants, anaerobic respiration produces ethanol and carbon dioxide (fermentation). Anaerobic respiration releases much less energy than aerobic respiration.
当氧气不足时发生无氧呼吸。在动物肌肉细胞中，产生乳酸，导致疲劳。在酵母和植物中，无氧呼吸产生乙醇和二氧化碳（发酵）。无氧呼吸释放的能量远少于有氧呼吸。
7. Photosynthesis and Plant Transport | 光合作用与植物运输
Photosynthesis is the process by which green plants and algae convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water. Chlorophyll in chloroplasts absorbs light energy mainly from the red and blue parts of the spectrum.
光合作用是绿色植物和藻类将光能转化为化学能，利用二氧化碳和水生成葡萄糖和氧气的过程。叶绿体中的叶绿素主要吸收光谱中红光和蓝光部分的光能。
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Leaves are adapted for photosynthesis with a large surface area, thin structure, numerous stomata for gas exchange and a network of veins for transport. Xylem tissue transports water and dissolved mineral ions from the roots upwards. Phloem tissue transports dissolved sugars (translocation) from the leaves to growing and storage parts of the plant.
叶片适应光合作用：具有较大的表面积、薄的结构、众多气孔进行气体交换以及叶脉网络运输物质。木质部组织将水和溶解的矿物质离子从根部向上运输。韧皮部组织将溶解的糖（运输作用）从叶片运输到植物的生长和储存部位。
Transpiration is the loss of water vapour from leaves, mainly through stomata. It creates a pull that helps to draw water up the xylem. Factors increasing transpiration rate include higher temperature, increased light intensity, low humidity and wind.
蒸腾作用是水蒸气从叶片（主要通过气孔）散失的过程。它产生一种拉力，帮助将水向上抽吸至木质部。提高蒸腾速率的因素包括温度升高、光照增强、湿度降低和刮风。
8. Ecosystems and Material Cycles | 生态系统与物质循环
An ecosystem is a community of living organisms interacting with each other and their non-living environment. Food chains show the transfer of energy and matter from producers (e.g. plants) to primary consumers, secondary consumers and eventually decomposers. At each trophic level, energy is lost through respiration, heat and waste.
生态系统是生物群落与它们所处的非生物环境相互作用的统一整体。食物链显示能量和物质从生产者（如植物）传递至初级消费者、次级消费者以及最终到分解者的流向。在每一营养级上，能量都会因呼吸、排热和废物的产生而损失。
Carbon is constantly cycled between the atmosphere, organisms and the Earth. Key processes in the carbon cycle include photosynthesis (takes CO₂ from the air), respiration and combustion (release CO₂), and decomposition. Deforestation and burning fossil fuels increase atmospheric CO₂, contributing to climate change.
碳在大气、生物体和地球之间不断循环。碳循环的关键过程包括光合作用（从空气中吸收 CO₂）、呼吸作用和燃烧（释放 CO₂）以及分解作用。森林砍伐和燃烧化石燃料会增加大气中的 CO₂，加剧气候变化。
The water cycle describes the continuous movement of water on, above and
Published by TutorHao | Year 10 Biology Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图