Year 10 CCEA Biology: Common Misconceptions and Correction Methods | 十年级 CCEA 生物：常见误区与纠正方法

📚 Year 10 CCEA Biology: Common Misconceptions and Correction Methods | 十年级 CCEA 生物：常见误区与纠正方法

Year 10 CCEA Biology introduces many fundamental processes, from cellular respiration to genetics and circulation. In the classroom, certain ideas become tangled, leading to persistent misconceptions that can trip up even hard-working students. This article picks out the most common errors and explains clearly what the science really says, so you can revise with confidence.

十年级 CCEA 生物学介绍了许多基本过程，从细胞呼吸到遗传学和循环系统。在课堂上，某些概念会变得纠缠不清，导致即使是很用功的学生也会产生顽固的误解。本文挑选出最常见的错误，并清楚地解释科学事实，让你能自信地复习。

1. Breathing Is Not Respiration | 呼吸不等于呼吸作用

Every year, students swap the words ‘breathing’ and ‘respiration’ as if they are identical. Breathing – properly called ventilation – is the mechanical movement of air into and out of the lungs. It involves the contraction and relaxation of the diaphragm and intercostal muscles, changing the volume and pressure inside the thorax.

每年都有学生把“呼吸”和“呼吸作用”这两个词互换，好像它们完全一样。呼吸——准确地说叫通气——是空气进出肺部的机械运动。它涉及膈肌和肋间肌的收缩与舒张，改变胸腔内的容积和压力。

Respiration, in contrast, is a biochemical pathway that occurs in the mitochondria of cells. It breaks down glucose to release energy, which is then stored in molecules of ATP. The overall aerobic respiration equation can be summarised as:

呼吸作用则相反，是一条发生在细胞线粒体中的生化途径。它分解葡萄糖以释放能量，然后把能量存储在ATP分子中。有氧呼吸作用的总方程式可概括为：

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy (ATP)

So while breathing supplies the oxygen needed for respiration and removes the carbon dioxide produced, they are not the same thing. Plant cells, for example, respire continuously but do not breathe at all – they rely on diffusion of gases through stomata. Keeping the terms straight is essential for exam success.

因此，尽管呼吸提供了呼吸作用需要的氧气，并排出了产生的二氧化碳，但它们并不是一回事。例如，植物细胞持续进行呼吸作用，但根本不呼吸——它们依靠气体通过气孔的扩散。准确区分这两个术语对考试成功至关重要。

2. Photosynthesis Only in Leaves? | 光合作用只发生在叶片中吗？

Textbooks often feature a leaf diagram when covering photosynthesis, so it is no surprise that learners think only leaves can do the job. The truth is that any part of a plant containing chlorophyll can carry out photosynthesis. Green stems, unripe green fruits, and even the green aerial roots of some orchids all possess chloroplasts.

课本在讲光合作用时通常会配一张叶片图，难怪学习者会以为只有叶片才能进行光合作用。真相是，植物任何含有叶绿素的部分都可以进行光合作用。绿色的茎、未成熟的绿色果实，甚至某些兰花的绿色气生根都含有叶绿体。

The process requires carbon dioxide, water, light energy and chlorophyll, and yields glucose and oxygen:

这个过程需要二氧化碳、水、光能和叶绿素，产生葡萄糖和氧气：

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (light energy & chlorophyll)

Leaves are structurally adapted – they are broad, flat and thin, with many stomata and a palisade layer packed with chloroplasts – which makes them the main photosynthetic organs. However, the stem of a cactus, for instance, takes over photosynthesis while the leaves are reduced to spines. Recognising this helps when tackling questions about unusual plant anatomy.

叶片在结构上是适应性的——它们宽、扁、薄，有许多气孔，栅栏组织充满了叶绿体——这使它们成为主要的光合器官。然而，例如仙人掌的茎就接管了光合作用，而叶子退化为刺。认识到这一点有助于解答有关特殊植物解剖结构的问题。

3. Plants Absorb Food from Soil? | 植物从土壤中吸收食物？

A very stubborn classroom myth is that plants get their food from the soil through their roots, much as we get food from a plate. In reality, plants are autotrophs: they manufacture their own organic food – primarily glucose – through photosynthesis. The soil provides water and dissolved mineral ions such as nitrates, phosphates, potassium and magnesium, which are used to build proteins, DNA and chlorophyll, but they are not the energy source.

一个非常顽固的课堂迷思是，植物通过根部从土壤中获取食物，就像我们从盘子里获取食物一样。事实上，植物是自养生物：它们通过光合作用制造自己的有机食物——主要是葡萄糖。土壤提供水和溶解的矿物质离子，如硝酸盐、磷酸盐、钾和镁，这些物质用来合成蛋白质、DNA和叶绿素，但它们并不是能量来源。

The famous 17th-century experiment by Jan Baptist van Helmont showed that a willow tree gained mass not from the soil (which lost only a tiny amount) but largely from water.

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

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