📚 Year 7 WJEC Biology: Interdisciplinary Problem-Solving Practice | 七年级 WJEC 生物：跨学科综合题型训练
In Year 7 WJEC Biology, you are often tested not only on your knowledge of living organisms but also on your ability to apply skills from mathematics, physics, chemistry and geography. This article provides a series of cross-curricular practice exercises designed to build your confidence in tackling questions that combine data handling, calculations, scientific equations, and real‑world problem solving. By working through these examples, you will learn how to interpret tables, draw graphs, calculate rates, use chemical symbols, and link biological concepts with other subjects—exactly the kind of thinking required for top marks.
在七年级 WJEC 生物考试中，你不仅需要掌握生物知识，还经常需要运用来自数学、物理、化学和地理等学科的技能。本文提供一系列跨学科综合题型训练，帮助你自信地应对涉及数据处理、计算、科学方程和实际问题的题目。通过这些示例，你将学会如何解读表格、绘制图表、计算速率、使用化学符号，并将生物学概念与其他学科联系起来——这正是获得高分所需的思维方式。
1. Working with Data Tables | 处理数据表格
Biology experiments often produce results that are easier to understand when displayed in a table. You need to be able to read values accurately and identify trends or unusual data points.
生物实验的结果通常以表格呈现，这样更容易理解。你需要能够准确读取数值，并识别出趋势或异常数据点。
The table below shows the number of oxygen bubbles released by pondweed at different distances from a lamp.
下表显示了水草在距离灯不同距离时释放的氧气气泡数。
| Distance from lamp (cm) | Bubbles per minute |
|---|---|
| 10 | 41 |
| 20 | 27 |
| 30 | 16 |
| 40 | 9 |
| 50 | 3 |
Look at the pattern: as the distance increases, the number of bubbles decreases. You might be asked to describe this relationship or to predict a value at 25 cm by reading between the data points.
观察规律：随着距离增加，气泡数量减少。你可能会被要求描述这种关系，或者通过读取数据点之间的值来预测 25 cm 处的数值。
If one cell contained a bubble count of 12, that would not fit the trend and could be an anomaly, possibly caused by a mistake in counting or an unexpected change in conditions.
如果某个格子里气泡数是 12，这不符合趋势，就可能是一个异常值，可能是由于计数错误或条件意外变化造成的。
2. Reading and Plotting Graphs | 阅读与绘制图表
A line graph drawn from a table of results helps to visualise the relationship between two variables. The independent variable (what you change) goes on the x‑axis, and the dependent variable (what you measure) goes on the y‑axis.
根据结果表格绘制的折线图有助于直观看出两个变量之间的关系。自变量（你改变的量）放在 x 轴上，因变量（你测量的量）放在 y 轴上。
Using the pondweed data, the distance from the lamp would be plotted on the x‑axis and the number of bubbles per minute on the y‑axis. You must label each axis with the quantity and unit, such as ‘Distance (cm)’ and ‘Bubbles per minute’, and choose a sensible scale.
使用水草数据时，灯的距离应标在 x 轴，每分钟气泡数标在 y 轴。你必须为每个轴标上量和单位，例如‘距离 (cm)’和‘每分钟气泡数’，并选择合适的刻度。
When you join the points, you will see a downward curve, showing that the relationship is not directly proportional. Exam questions often ask you to use the line to estimate values between plotted points or to extrapolate the trend.
连接各点后，你会看到一条向下的曲线，表明这种关系不是成正比的。考试题目常要求你利用连线估计已标点之间的数值，或外推趋势。
Always use a sharp pencil and a ruler to draw axes, and do not forget to give your graph a clear title such as ‘The effect of light distance on photosynthesis in pondweed’.
务必使用削尖的铅笔和直尺绘制坐标轴，并别忘了给图表加上清晰的标题，如‘光距离对水草光合作用的影响’。
3. Averages, Ranges and Rates | 平均值、范围与速率
To make results more reliable, you often repeat measurements and calculate a mean. The mean is found by adding all the values and dividing by the number of values.
为了让结果更可靠，你常常需要重复测量并计算平均值。平均值由所有数值相加后除以数值个数得到。
mean = sum of values ÷ number of values
平均值 = 数值总和 ÷ 数值个数
8) ÷ 3 = 78 bpm. The range is the difference between the highest and lowest value, here 80 – 76 = 4 bpm.
例如，如果你测量了三次脉搏（76、80、78 次/分），平均值就是 (76+80+78) ÷ 3 = 78 次/分。范围是最大值和最小值之差，这里 80 – 76 = 4 次/分。
A rate tells you how quickly something happens. In a fermentation experiment, you might collect 30 cm³ of carbon dioxide in 5 minutes. The rate of gas production is:
速率表示某事发生的快慢。在一个发酵实验中，你可能在 5 分钟内收集到 30 cm³ 二氧化碳。气体产生速率是：
rate = volume ÷ time = 30 cm³ ÷ 5 min = 6 cm³/min
速率 = 体积 ÷ 时间 = 30 cm³ ÷ 5 分钟 = 6 cm³/分钟
Always include the correct units when you write a rate; common units are cm³/min, bubbles/min, or m/s for diffusion.
写速率时一定要带上正确的单位；常见单位有 cm³/分钟、气泡/分钟，或扩散的 m/s。
4. Percentage Change and Ratios in Experiments | 实验中的百分比变化与比率
Percentages help you compare changes fairly when the starting values are different. The formula for percentage change is:
当初始值不同时，百分比可以帮助你公平地比较变化。百分比变化公式是：
percentage change = (new value – original value) ÷ original value × 100%
百分比变化 = (新值 – 原值) ÷ 原值 × 100%
d with 80 seeds, and 60 seeds sprouted. The germination percentage is (60 ÷ 80) × 100 = 75% d of calculation appears frequently when comparing control groups and experimental groups.
假设一个种子发芽试验用 80 粒种子，60 粒发芽。发芽百分比是 (60 ÷ 80) × 100 = 75%。这类计算在比较对照组和实验组时经常出现。
Ratios are also useful. If the mass of a plant’s root system is 40 g and the shoot mass is 20 g, the root‑to‑shoot ratio is 2 : 1. This can show how a factor such as light affects how plants allocate resources.
比率也很有用。如果一棵植物的根系质量为 40 g，枝叶质量为 20 g，则根冠比为 2 : 1。这可以显示光照等因素如何影响植物的资源分配。
When answering questions, simplify ratios by dividing both sides by the same number, and express them using a colon.
回答问题时，通过用相同数字除以两边来简化比率，并用冒号表示。
5. Food Chains and Energy Calculations | 食物链与能量计算
Energy moves along a food chain, but only about 10% is passed from one trophic level to the next. The rest is used for life processes or lost as heat.
能量沿食物链流动，但只有大约 10% 从一个营养级传递到下一个营养级。其余用于生命活动或作为热量散失。
If the plants in a food chain contain 5 000 kJ of energy, the herbivores that eat them receive about 500 kJ, and the carnivores that eat the herbivores get roughly 50 kJ. These numbers can be shown in a pyramid of numbers or a pyramid of energy.
如果食物链中的植物含有 5 000 kJ 能量，那么吃植物的食草动物大约获得 500 kJ，而吃食草动物的食肉动物大约获得 50 kJ。这些数字可以用数量金字塔或能量金字塔表示。
stores 800 kJ and a mouse eats the grass, how much energy is likely available to the mouse? (10% of 800 = 80 kJ). Always show your working.
典型的考试题目会要求你计算消费者获得的能量。例如，如果一株草储存了 800 kJ，老鼠吃了草，老鼠很可能获得多少能量？（800 的 10% = 80 kJ）。务必展示计算过程。
Remember, energy pyramids explain why most food chains are short; there is not enough energy left to support many top predators.
请记住，能量金字塔解释了为什么大多数食物链很短；剩下的能量不足以养活很多顶级捕食者。
6. Sampling Methods and Mathematics | 采样方法与数学
Ecologists use quadrats to estimate the population size of plants in a large area. A 1 m² quadrat is placed randomly several times, and the number of the target species is counted each time.
生态学家使用样方来估算大面积区域内植物的种群大小。将一个 1 m² 的样方随机放置多次，每次记录目标物种的数量。
he field has an area of 300 m², the estimated total population is 5 × 300 = 1 500 daisies.
如果五个样方的雏菊计数分别是 3, 6, 4, 7 和 5，则每个样方的平均数为 (3+6+4+7+5) ÷ 5 = 5 株/m²。如果田野面积为 300 m²，则估计总数是 5 × 300 = 1 500 株。
5 m² sampled. This mathematical approach links biology fieldwork to area and proportion calculations.
你也可能需要计算采样的总面积：5 个样方 × 1 m² = 5 m² 采样面积。这种数学
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