CAIE生物 MRS GREN 七项特征 双名法 检索表
CAIE IGCSE 生物 0610 的第一章看起来最轻，考试里丢分却一点不少。2026 至 2028 年版考纲把生命特征写成七条固定措辞的定义，阅卷时按关键词给分，写不出 nutrient molecules、metabolism、dry mass 这几个词，意思再对也拿不到那一分。这篇按考纲 1.1 到 1.3 的顺序把容易混的概念拆开，最后给出可以直接照做的复习节奏。
The first chapter of the CAIE IGCSE Biology 0610 syllabus looks like the easiest part of the course, yet it is where careful students still drop marks. The syllabus fixes the wording of the seven characteristics, and mark schemes reward that wording rather than a sensible paraphrase; missing phrases such as nutrient molecules, metabolism or dry mass costs a mark even when the biology behind the answer is sound. This guide works through sections 1.1 to 1.3 in syllabus order, separates the pairs that get confused, and ends with a revision rhythm you can actually keep.
七个生命特征的官方措辞
考纲 1.1 把七条定义写得很具体，措辞不能随意替换。移动（movement）指有机体或身体的一部分产生位置改变的动作。呼吸（respiration）指细胞内分解营养分子并释放能量供代谢使用的化学反应。感应（sensitivity）指察觉并回应内外环境变化的能力。生长（growth）指体积与干重的永久增加。生殖（reproduction）指产生同类新个体的过程。排泄（excretion）指排掉代谢废物与超过需要的物质。营养（nutrition）指摄取材料用于能量、生长与发育。
The syllabus states all seven characteristics as formal definitions, and the wording is what earns the mark. Movement covers any action that changes the position of an organism or part of it, which is why a shoot bending towards light counts just as much as a runner crossing a line; respiration is defined as the chemical reactions in cells that break down nutrient molecules and release energy for metabolism. Examiners rarely accept a loose paraphrase such as breathing or getting energy, because both miss the cellular level the definition is testing. Learn the English sentence rather than a translation of it.
生长为什么卡在干重这个条件上
考纲把生长写成体积与干重的永久增加，两个条件缺一不可。干重指烘干去掉水分之后的有机物质总量，吸水膨胀不算生长。一颗干种子泡一夜体积翻倍，干重没变，所以那不是生长；幼苗长出新叶，干重上升，才算。永久这个词也不多余，一天之内身高变化属于脊柱压缩与恢复。很多学生以为长得快就是细胞变大，其实细胞分裂增加数量与细胞伸长增加体积各占一部分，根尖与茎尖的分生组织负责前者。常见的错误是只写 size increase，把 dry mass 漏掉，简答题的两分里就只剩一分。做实验设计题时，测干重要先称鲜重再烘干到恒重，否则残水会让结果偏高。
Growth is defined as a permanent increase in size and dry mass, and both halves of that definition matter. Dry mass is the mass left after water has been driven off, so a dry seed that swells overnight in water has grown larger on the outside while its dry mass has not moved at all; only new tissue built from assimilated material counts. The word permanent rules out the height difference between early morning and late evening, which is compression of the spine rather than growth. Examiners see the same shortfall most years: candidates write that an organism gets bigger and never mention dry mass, which caps the answer at half the available marks.
呼吸与呼吸作用不是一件事
呼吸作用在考纲里是细胞内分解营养分子、释放能量供代谢使用的化学反应，跟肺部的通气完全两回事。气体交换是机械运动加扩散，呼吸作用发生在线粒体与细胞质里，两者只有在需要氧气时才连在一起。写答案时用 respiration 指细胞内的过程，用 gas exchange 或 ventilation 指肺与鳃的动作。厌氧呼吸不经过线粒体，酵母把葡萄糖分解成酒精与二氧化碳，人体肌肉在剧烈运动时产生乳酸并形成氧债。很多学生以为呼吸作用就是吸氧，其实厌氧条件下同样在释放能量，只是每分子葡萄糖释放得少得多。常见的错误是把 energy 写成 food，能量来自营养分子的化学键，食物只是载体。这类术语混用一旦成习惯，简答题很难写完整。
Respiration is a cellular process, while breathing is a mechanical one, and the two are only linked when oxygen is involved. Gas exchange moves oxygen and carbon dioxide across surfaces such as alveoli or gills by diffusion, whereas respiration breaks down nutrient molecules inside the cytoplasm and mitochondria to release energy for metabolism. In anaerobic conditions the release of energy continues without oxygen, producing alcohol and carbon dioxide in yeast and lactic acid in exercising muscle, which builds an oxygen debt and needs extra oxygen afterwards. A common error is writing that food provides energy directly; the energy is released when nutrient molecules are broken down, and food is simply the material that supplies them.
排泄与排遗的分界
排泄只针对代谢废物与超过需要的物质，未消化的食物残渣排出体外叫 egestion，不属于排泄。二氧化碳由肺排出，尿素、多余的水与离子由肾脏排出，这两条是考纲 13.1 的原话。植物没有肾脏，落叶与树皮脱落带走部分废物，气孔排出的氧气与二氧化碳承担气体交换与代谢产物处理。很多学生以为粪便里既然有废物就算排泄，其实粪便是没进过细胞的食物残余，从来没有参与代谢。常见的错误是把汗算成主要排泄途径，考纲只把肺与肾列为人类的排泄器官。写对比题时先判断物质有没有进入细胞代谢，这条线一划就清楚了。把两个英文词并排写进答案，比用中文解释更省时间。
Excretion removes the waste products of metabolism, while egestion passes out material that was never absorbed and never took part in metabolism at all. In humans the lungs excrete carbon dioxide and the kidneys excrete urea together with excess water and ions, and the syllabus lists those two routes rather than sweat glands, which lose only small amounts of water and salts. A frequent slip is treating faeces as excretory waste because it looks unpleasant, when in fact the gut contents never crossed into a cell. Once you decide whether a substance entered cellular metabolism, the classification follows without memorising two separate lists.
感应里的刺激与反应
感应指察觉并回应内外环境变化的能力，刺激叫 stimulus，回应叫 response，两个词在简答题里各占一个得分点。向光性的反应由生长素分布不均造成，茎尖感受光的方向，背光侧细胞伸长得更快，茎就朝光弯曲。根向地生长靠的是重力方向下的生长素分布，根尖对生长素更敏感，浓度高的一侧伸长反而受抑制。很多学生以为植物没有神经系统就不算有感应，考纲把感应定义为能力，不要求必须有神经。常见的错误是把刺激写成环境本身，例如把光写成刺激，其实光强的变化才是刺激。例子写具体一点，比重复定义更容易得分。光合作用与向光性不要混在一段里写，前者是营养，后者才是感应。
Sensitivity is the ability to detect and respond to changes in the internal or external environment, and mark schemes usually look for a named stimulus and a named response. A shoot growing towards light does not need a nervous system: light alters the distribution of auxin at the tip, cells on the shaded side elongate more, and the stem bends towards the source; roots respond to gravity in the opposite way. Candidates often describe light itself as the stimulus, when the change in light intensity or direction is the more precise answer. Naming a plant example alongside the definition is usually what turns a half mark into a full one.
物种定义与可育后代
考纲把物种定义为能够相互繁殖并产生可育后代的一群生物。马与驴能生出骡，但骡通常不育，所以马和驴是两个不同的物种，这个例子在卷子里出现频率很高。可育这个词是关键，能不能交配并不决定物种，能不能产生有繁殖能力的后代才决定。很多学生以为长得像就是同一物种，其实分类依据是生殖关系与共同特征，外形相似只是线索。常见的错误是把骡子当成新物种，它没有稳定的繁殖群体。写解释题时把 fertile offspring 两个词写全，只写 offspring 常常不算完整。狗的各品种体型差得很大却能相互繁殖，它们仍然属于同一物种。
A species is a group of organisms that can reproduce to produce fertile offspring, and fertile is the word that decides most exam cases. Horses and donkeys can mate and produce a mule, but mules are normally infertile, so the parents remain separate species rather than one unusually variable species. Looking alike is weaker evidence than breeding successfully, which is why dog breeds of very different sizes still count as one species. A common error is calling the mule a new species; a hybrid that cannot form a breeding population does not qualify, however healthy it looks.
双名法的书写规则
双名法是一套国际公认的命名系统，学名由属名与种加词两部分组成。属名首字母大写，种加词全部小写，印刷时整段斜体，手写时在下面画横线。Homo sapiens 是人，Panthera leo 是狮，属名相同说明亲缘更近。考纲 1.2 只要求说明这套系统是国际通用的，不要求解释命名优先权之类的细节。很多学生以为种加词也可以大写，只要属名大写就算规范，其实两个词的规则不一样。常见的错误是把属名在句首缩写，正式答案里第一次出现要写全称。写分类题时把斜体或下划线明确表现出来，卷面上一个格式细节就是一个得分点。
The binomial system is an internationally agreed convention in which a scientific name has two parts, the genus and the species. The genus takes a capital letter, the species epithet is written entirely in lower case, and the whole name is printed in italics or underlined when handwritten. Shared genus names point to closer relationship, which is why Panthera leo and Panthera tigris sit in one genus while the species parts keep them apart. Answers lose marks for capitalising both words or for dropping the italics, so treat the format as part of the content rather than decoration.
二歧检索表的构造与扣分点
二歧检索表每一级给出两条互斥的描述，选一条继续往下，直到一个名字只对应一种生物。写检索表时每一对陈述必须能同时看到，判断依据要是可观察的特征，例如腿的对数、翅的有无、触角的形状。数量化的特征比主观描述稳定，写六条腿比写很多腿更可靠。很多学生以为只要把生物分开就行，其实同一层级的两条描述不能有交集，否则读者无法继续。常见的错误是把三个选项塞进一对陈述里，二歧的意思就是二选一。条目编号可以用 1a 与 1b 表示，比写成整段文字清晰得多。做完后自己从第一条走到最后一条，看有没有走不通的分支。
A dichotomous key splits organisms at each step into two mutually exclusive descriptions, and the reader keeps choosing one until a single name is reached. Each pair should be observable at the same time on the same specimen, so counting legs or checking for wings works better than judging behaviour, and a numerical feature such as six legs beats a vague phrase like many legs. The most frequent fault is writing three alternatives in one couplet, which stops being dichotomous altogether. Numbering the pairs 1a and 1b, then walking the whole route yourself, exposes dead ends before the examiner finds them.
五界划分与病毒的位置
考纲的补充内容要求把生物放进动物、植物、真菌、原核生物与原生生物五个界。原核生物没有真正的细胞核，细菌是典型代表；原生生物多为单细胞且具真核，例如变形虫与衣藻；真菌有细胞壁但成分是几丁质，营养方式为腐生。病毒只有蛋白质外壳与遗传物质，没有细胞结构，不能自行繁殖，所以不放进五个界里。很多学生以为病毒是最小的生物，其实它是否符合生命的定义本身就有争议，考纲只要求写出蛋白质外壳与遗传物质两个特征。常见的错误是把细菌归进原生生物，两者的细胞结构完全不同。比较题里把有没有细胞核作为分界，答案会清楚很多。
The five-kingdom system places organisms in animal, plant, fungus, prokaryote and protoctist groups. Prokaryotes have no true nucleus, protoctists are mostly single-celled eukaryotes such as Amoeba and Chlamydomonas, and fungi have cell walls made of chitin and feed saprophytically. Viruses are excluded because they consist only of a protein coat and genetic material, and cannot reproduce without a host cell. Mixing bacteria into the protoctists is a standard slip, and the presence or absence of a true nucleus settles the comparison quickly.
脊椎动物五类与节肢动物四类
脊椎动物的五个类群是哺乳类、鸟类、爬行类、两栖类与鱼类，判断依据包括体表覆盖物、体温调节方式与繁殖方式。哺乳类体表有毛、胎生并哺乳，鸟类有羽毛与喙，爬行类有干燥鳞片且卵有革质壳，两栖类皮肤湿润、幼体用鳃成体用肺，鱼类用鳃呼吸并有鳍。节肢动物的四个类群是倍足类与蜈足类、昆虫、蛛形类与甲壳类，腿的对数与体节是主要判据。昆虫六条腿、身体分三段；蛛形类八条腿、身体分两段；甲壳类触角两对；倍足类与蜈足类体节多且腿多。很多学生以为蜘蛛是昆虫，数腿就能分开。常见的错误是只写有翅膀，其实并非所有昆虫成虫都有翅。
Vertebrates are grouped as mammals, birds, reptiles, amphibians and fish, judged by body covering, temperature regulation and method of reproduction. Arthropods split into myriapods, insects, arachnids and crustaceans, and counting legs is the quickest discriminator: insects have six legs and three body sections, arachnids have eight legs and two sections, crustaceans carry two pairs of antennae, and myriapods have many segments each bearing legs. Calling a spider an insect is the classic error, and the leg count corrects it in one step. Wings are weak evidence on their own, since not every adult insect has them.
试卷结构与分数怎么分
所有考生考三份卷子。Core 考生考 Paper 1 选择题四十五分钟四十分占三成、Paper 3 简答与结构化题一小时十五分钟八十分占五成，再从 Paper 5 实验操作与 Paper 6 实验替代卷中选一份，四十分占两成。Extended 考生把 Paper 1 与 Paper 3 换成 Paper 2 与 Paper 4，时长与分数完全相同，但题目覆盖 Core 与补充两部分内容，最高可拿 A*。只学 Core 内容的考生最高只能拿 C，这条写在同一页考纲上，选课前要看清楚。评分目标里知识与理解占五成、信息处理与解题占三成、实验技能占两成。很多学生以为选择题分值低就不必练，其实四十分占三成，错三道就是明显的差距。常见的错误是把 Paper 5 与 Paper 6 当成两份都要考，实际只需其中一份。
Every candidate sits three components. Core candidates take Paper 1, a 45-minute multiple-choice paper worth 40 marks and 30 per cent, and Paper 3, a 1 hour 15 minute written paper worth 80 marks and 50 per cent, then choose either the practical test or the alternative to practical for the remaining 20 per cent. Extended candidates swap in Papers 2 and 4, which carry the same marks and timing but test the supplement as well, and can reach A*. The syllabus also states that candidates taught only the core content cannot score above grade C, which is worth checking before option choices are made. Assessment objectives split as 50 per cent knowledge and understanding, 30 per cent handling information and problem solving, and 20 per cent experimental skills.
把这一章排进四周复习节奏
这一章内容少，但定义密集，分散到四周比集中背一天有效。开始的两周每天用十分钟默写七条定义，写完对照考纲原文改，错一个词就整条重写。第三周把物种定义、双名法与检索表合成一组练习，自己给五种常见生物做一张二歧检索表，再从第一条走到最后一条检查。最后一周做两套历年 Paper 2 的相关选择题，把错题按概念归类，别只记答案。阅卷时最常见的情况是定义写对了一半，关键词缺一个就少一分，所以默写要以词为单位对照。很多学生以为背完中文解释就够了，考试要的是英文术语，读题时反应慢半拍就会漏条件。这一步最容易忽略的是时间分配，选择题平均一分钟一题，超时就先跳过。
The content here is short but definition-heavy, so spreading it across four weeks beats one long session. In the first fortnight, write out the seven characteristics from memory every day for ten minutes and check each sentence against the syllabus wording, rewriting the whole line when a keyword is missing. Midway through, group the species definition, binomial rules and keys into one task: build a key for five familiar organisms, then follow it from the first couplet to the last name. In the final week, work through two past multiple-choice papers on this topic and sort your mistakes by concept rather than noting the right letters. Marking shows the same pattern each year, with half-correct definitions that are missing one keyword, which is why the weekly check has to be word by word.
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