Year 10 Edexcel Biology: Common Misconceptions and How to Correct Them | Year 10 Edexcel 生物常见误区与纠正方法

📚 Year 10 Edexcel Biology: Common Misconceptions and How to Correct Them | Year 10 Edexcel 生物常见误区与纠正方法

Many Year 10 students studying Edexcel Biology hold persistent misconceptions that can hinder deeper understanding. Identifying and correcting these common errors early will help you build a solid foundation for your GCSE exams. This article highlights twelve typical misunderstandings across key topics and provides clear, accurate explanations to set the record straight.

许多学习 Edexcel 生物的 Year 10 学生常有一些顽固的误区，这会阻碍更深入的理解。尽早发现并纠正这些常见错误，能帮助你为 GCSE 考试打下坚实基础。本文重点介绍了十二个跨关键主题的典型误解，并提供清晰准确的解释，以正视听。

1. ‘Animal cells have a cell wall’ | 细胞误区：“动物细胞有细胞壁”

Misconception: Many students think that all cells, including animal cells, have a cell wall to provide support.

误区：许多学生认为所有细胞（包括动物细胞）都有细胞壁来提供支撑。

Correction: Only plant cells, fungal cells and bacterial cells possess a cell wall made of cellulose, chitin or peptidoglycan respectively. Animal cells have a flexible cell membrane as the outer boundary; they rely on an internal cytoskeleton and the skeletal system for support.

纠正：只有植物细胞、真菌细胞和细菌细胞分别具有由纤维素、几丁质或肽聚糖构成的细胞壁。动物细胞以柔韧的细胞膜为外边界，依靠内部的细胞骨架和骨骼系统提供支撑。

Another related error is thinking that chloroplasts are present in all plant cells. In reality, root cells and other non-photosynthetic plant cells lack chloroplasts.

另一个相关错误是认为所有植物细胞都有叶绿体。实际上，根部细胞和其他非光合作用的植物细胞缺乏叶绿体。

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2. ‘Osmosis is just the same as diffusion’ | 扩散与渗透：“渗透和扩散是一样的”

Misconception: Osmosis is often simply called ‘diffusion of water’ without recognising the special requirement of a partially permeable membrane.

误区：渗透常被简单说成“水的扩散”，而没有认识到半透膜的特殊要求。

Correction: Osmosis is the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution) through a partially permeable membrane. Diffusion, on the other hand, does not require a membrane and involves any type of particle moving down a concentration gradient.

纠正：渗透是水分子通过半透膜从较高水势（稀溶液）区域向较低水势（浓溶液）区域的净移动。而扩散不需要膜，涉及任何类型的粒子沿浓度梯度移动。

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3. ‘Enzymes are killed by high temperatures’ | 酶：“高温会杀死酶”

Misconception: Students often say that boiling an enzyme kills it, as if it were alive.

误区：学生常说煮沸酶会“杀死”它，就好像酶是活的。

Correction: Enzymes are proteins, not living organisms. High temperatures cause the enzyme’s active site to lose its specific shape permanently – a process called denaturation. The enzyme is not killed; it is denatured and can no longer catalyse reactions. Boiling denatures most enzymes, but they do not die.

纠正：酶是蛋白质，不是生物体。高温会导致酶的活性部位永久性地丧失其特定形状——这一过程称为变性。酶没有被杀死，而是变性了，不能再催化反应。煮沸会使大多数酶变性，但它们不会死亡。

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4. ‘Plants only photosynthesise during the day’ | 光合作用：“植物只在白天进行光合作用”

Misconception: It is common to think that photosynthesis occurs all day long and plants do not respire at night, or that respiration only happens in the dark.

误区：通常认为光合作用整天进行而植物在夜间不呼吸，或者呼吸作用只在黑暗中发生。

Correction: Photosynthesis requires light energy, so it only occurs during the day. However, plants respire continuously, day and night, to release energy for life processes. The carbon dioxide produced by respiration is used in photosynthesis during the day, but at night plants still take in oxygen and release carbon dioxide.

纠正：光合作用需要光能，所以只在白天进行。然而，植物持续不断地进行呼吸作用，无论白天黑夜，以释放生命活动所需的能量。呼吸产生的二氧化碳在白天被光合作用利用，但在晚上植物仍吸收氧气并释放二氧化碳。

The balanced symbol equation for photosynthesis is: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

光合作用的平衡符号方程为：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。

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5. ‘A dominant allele is always more common’ | 遗传：“显性等位基因总是更常见”

Misconception: Because a dominant allele ‘masks’ the recessive one, students often assume it is the most frequent allele in a population.

误区：由于显性等位基因“掩盖”了隐性等位基因，学生常以为它在种群中是最常见的等位基因。

Correction: Dominant does not mean common. The frequency of an allele depends on evolutionary advantage, not on dominance. For example, polydactyly (extra fingers) is caused by a dominant allele, yet it is rare. Conversely, the allele for type O blood is recessive but very common in many populations.

纠正：显性并不等于常见。等位基因的频率取决于进化优势，而非显隐性。例如，多指（额外的手指）是由显性等位基因引起的，但很罕见。相反，O型血的等位基因是隐性的，但在许多人群中很常见。

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6. ‘Individuals adapt and evolve during their lifetime’ | 自然选择：“个体会在其一生中适应并进化”

Misconception: Learners often say that a giraffe stretched its neck to reach higher leaves and then passed this longer neck to its offspring.

误区：学习者常说长颈鹿伸长脖子去够高处的叶子，然后把更长的脖子遗传给后代。

Correction: Evolution by natural selection acts on populations over generations, not on individuals. Genetic variation already exists in a population. Organisms with advantageous traits are more likely to survive and reproduce, passing those alleles to the next generation. The giraffe’s long neck evolved because ancestors with slightly longer necks had a survival advantage, not because individuals stretched.

纠正：自然选择的进化作用于种群多个世代，而非个体。种群中已存在遗传变异。具有有利性状的生物更有可能生存和繁殖，将这些等位基因传给下一代。长颈鹿的长脖子进化是因为具有稍长脖子的祖先有生存优势，而不是因为个体伸长脖子。

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7. ‘All arteries carry oxygenated blood’ | 循环系统：“所有动脉都携带含氧血”

Misconception: The simple rule ‘arteries = oxygenated, veins = deoxygenated’ leads to error when considering the pulmonary circulation.

误区：简单的规则“动脉=含氧血，静脉=缺氧血”在考虑肺循环时就会出错。

Correction: Arteries carry blood away from the heart, while veins carry blood towards the heart. The pulmonary artery carries deoxygenated blood from the heart to the lungs, and the pulmonary vein carries oxygenated blood back to the heart. Similarly, the umbilical artery in a fetus carries deoxygenated blood. The distinction is based on direction of flow, not oxygenation level.

纠正：动脉将血液带离心脏，静脉将血液带回心脏。肺动脉将缺氧血从心脏带到肺部，肺静脉将含氧血带回心脏。同样，胎儿体内的脐动脉也输送缺氧血。区分基于血流方向，而非含氧水平。

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8. ‘Breathing and respiration are the same thing’ | 呼吸：“呼吸与呼吸作用是一回事”

Misconception: The term ‘respiration’ is frequently confused with ‘breathing’ (ventilation).

误区：术语“呼吸作用”经常与“呼吸”（通气）混淆。

Correction: Breathing (ventilation) is the physical process of moving air into and out of the lungs. Respiration is the chemical process that releases energy from glucose inside cells. It is important to use the word ‘respiration’ when referring to aerobic or anaerobic energy release. Aerobic respiration equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy.

纠正：呼吸（通气）是将空气移入和移出肺部的物理过程。呼吸作用是在细胞内从葡萄糖释放能量的化学过程。在提到有氧或无氧释放能量时，务必使用“呼吸作用”一词。有氧呼吸方程式：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 能量。

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9. ‘Bile is an enzyme that digests fats’ | 消化：“胆汁是消化脂肪的酶”

Misconception: Bile is often placed in the same category as lipase, with students thinking it chemically breaks down fat molecules.

误区：胆汁常被归入脂肪酶一类，学生认为它能化学分解脂肪分子。

Correction: Bile is not an enzyme; it is an alkaline fluid produced by the liver, stored in the gall bladder. Bile emulsifies fats by breaking large fat globules into

Published by TutorHao | Year 10 Biology Revision Series | aleveler.com

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