Year 7 CCEA Biology: Practical Assessment Essentials | Year 7 CCEA 生物实验/实践考核要点

📚 Year 7 CCEA Biology: Practical Assessment Essentials | Year 7 CCEA 生物实验/实践考核要点

Practical work is a vital part of Year 7 CCEA Biology. It helps you develop scientific skills such as observing, measuring, recording data and drawing conclusions. In assessments, you will be tested on your ability to plan fair tests, use equipment safely, and interpret results. This guide covers the essential practical skills you need to succeed.

实验操作是 Year 7 CCEA 生物学的重要部分。它帮助你培养观察、测量、记录数据和得出结论等科学技能。在考核中，你将接受设计公平实验、安全使用仪器和解释结果的能力测试。本指南涵盖了你需要掌握的关键实践技能。

1. Laboratory Safety and Rules | 实验室安全与规则

Before starting any experiment, you must understand and follow safety rules. Always wear safety goggles to protect your eyes from chemicals or heat. Tie back long hair and tuck in loose clothing. Never eat, drink or run in the laboratory. Listen carefully to your teacher’s instructions and never attempt any experiment without permission.

在开始任何实验之前，你必须理解并遵守安全规则。始终佩戴护目镜，以保护眼睛免受化学品或热量的伤害。将长发绑好并束好宽松的衣物。严禁在实验室吃喝或奔跑。仔细听取老师的指导，未经许可不得尝试任何实验。

If you spill a chemical or break glassware, inform your teacher immediately. Know the location of safety equipment such as the fire extinguisher, eye wash station and first aid kit. When heating substances, use tongs or heat-proof mats and point test tubes away from yourself and others.

如果溢出化学品或打破玻璃器皿，请立即告知老师。了解灭火器、洗眼站和急救箱等安全设备的位置。加热物质时，使用坩埚钳或隔热垫，并将试管口朝向远离自己和他人的方向。

Wash your hands after handling biological materials or chemicals. A clean and tidy workspace reduces the risk of accidents. These rules are not just for passing a test – they ensure everyone stays safe while doing real science.

在处理生物材料或化学品后要洗手。整洁的工作空间可降低事故风险。这些规则不仅仅是为了通过考试——它们确保每个人在从事真正的科学探究时都能保持安全。

2. Common Laboratory Equipment | 常用实验器材

You need to recognise basic equipment and know their uses. A beaker is used for holding or heating liquids. A conical flask is useful for swirling solutions without spillage. A measuring cylinder measures liquid volume accurately. A test tube holds small samples, and a test tube rack keeps them upright.

你需要识别基本器材并了解其用途。烧杯用于盛放或加热液体。锥形瓶便于摇晃溶液而不溢出。量筒可精确测量液体体积。试管用于盛放少量样品，试管架则使试管保持直立。

A Bunsen burner provides a heat source; learn to use the air hole to produce a blue roaring flame for heating. A tripod and gauze support a beaker over the flame. A thermometer measures temperature, and a stopwatch records time. Forceps and a scalpel are used for dissection or handling small specimens; always handle them with care.

本生灯提供热源；学会调节空气孔以产生用于加热的蓝色火焰。三脚架和石棉网用于支撑火焰上方的烧杯。温度计测量温度，秒表记录时间。镊子和解剖刀用于解剖或处理小型标本；务必小心使用。

A microscope is the most important biology tool. It allows you to see cells and microorganisms. You must also be familiar with glass slides, cover slips, pipettes and iodine solution for making wet mounts. Practice naming and drawing each piece of equipment, as labelling diagrams is a common assessment task.

显微镜是最重要的生物学工具。它能让你看到细胞和微生物。你还必须熟悉载玻片、盖玻片、滴管和碘液，用于制作临时装片。练习命名并绘制每种器材，因为标注图表是常见的考核任务。

3. Using a Microscope | 使用显微镜

A typical school microscope has an eyepiece lens, objective lenses (usually 4×, 10×, and 40×), a stage, mirror or built-in light source, focusing knobs and clips to hold the slide. Total magnification is calculated by multiplying the eyepiece magnification by the objective magnification.

典型的学校显微镜配有目镜、物镜（通常为4倍、10倍和40倍）、载物台、反光镜或内置光源、调焦旋钮以及固定玻片的夹子。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

总放大倍数 = 目镜放大倍数 × 物镜放大倍数

Always start with the lowest power objective lens to locate the specimen. Use the coarse focus knob first, looking from the side to prevent the lens from crushing the slide. Once the image is roughly clear, switch to a higher power and use the fine focus for a sharp image. Never use the coarse focus with the high-power objective, as this can break the slide.

Published by TutorHao | Year 7 Biology Revision Series | aleveler.com

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