📚 Year 8 WJEC Biology: Case Study Practicum | 八年级 WJEC 生物：案例分析实战演练
Case studies are a powerful way to apply theoretical biology to real-world situations. In this article, we will work through several practical case studies aligned with the Year 8 WJEC Biology curriculum. Each scenario challenges you to use your knowledge of cells, body systems, ecology, genetics and more to explain observations and solve problems.
案例分析是将理论生物学应用于实际情境的有效方法。在本文中，我们将通过多个与八年级 WJEC 生物课程同步的实战案例进行演练。每个场景都要求你运用有关细胞、身体系统、生态学、遗传学等知识来解释现象并解决问题。
1. How to Approach a Case Study in Biology | 如何应对生物学案例研究
Start by reading the scenario carefully and underline key terms. Identify which biology topic it relates to, such as photosynthesis, food chains or enzyme action. Organise your answer by first describing the science concept, then applying it to the situation, and finally drawing a conclusion. Use data from the case, such as tables or graphs, to support your explanation.
首先要仔细阅读案例情景并划出关键词。确定它涉及哪个生物学主题，比如光合作用、食物链或酶的作用。组织答案时，先描述科学概念，然后将其应用到具体情境中，最后得出结论。利用案例中的数据，如表格或图表，来支持你的解释。
2. Case 1: Pond Food Web Disruption | 案例1：池塘食物网破坏
A small freshwater pond contains algae (producers), water fleas (primary consumers), small fish (secondary consumers), large fish (tertiary consumers) and kingfishers (top predators). After a nearby field is sprayed with herbicide, run-off causes a sudden mass die-off of algae.
一个小型淡水池塘中有藻类（生产者）、水蚤（初级消费者）、小鱼（次级消费者）、大鱼（三级消费者）和翠鸟（顶级捕食者）。附近田地喷洒除草剂后，径流导致藻类突然大量死亡。
Predict and explain what will happen to the populations of the other organisms over the next few weeks.
预测并解释未来几周内其他生物的种群数量会发生什么变化。
Without producers, the base of the food web collapses. Water fleas lose their food source and their population declines sharply. This causes small fish to experience a food shortage, so their numbers also drop. With fewer small fish, large fish may initially survive on remaining food but soon decline. Kingfishers, relying on large fish, will eventually decrease as well. Energy flow is interrupted, and the whole ecosystem suffers. Ecological balance is fragile.
没有生产者后，食物网的基础
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