In the PPT ecosystem of the food chain and food web under the Jinan version of Biology, this kind of relationship between eating and eaten food is the most common and basic relationship between organisms and producers . Learning objectives: 1. The concepts of food chain and food web. 2. The phenomenon of biological enrichment, explaining that certain harmful substances will continue to accumulate through the food chain. 3. Clarify the correct way of writing the food chain, and connect the food web correctly. 4. Cultivate the consciousness of the passion for nature and the ecological environment. Focus: Food chains and food webs formed by food relationships in the ecosystem. Difficulties: Understand the food chain and food web composed of food relationships; analyze graphic materials to understand the phenomenon of biological enrichment.

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