一、教学背景分析1.内容分析:本节课是人教版生物必修3《稳态与环境》的第5章第1节。该节内容主要从“生态系统的组成成分”和“食物链和食物网”这两个方面来阐明生态系统中的结构。生态系统是生命系统层次中的一环,是由生物群落及其生活的无机环境共同作用构成的。学习这节课需要充分利用学生已有知识和生活经验,通过一个具体生态系统的分析,理解生态系统的结构是由各个组分组成的,并且它们之间相 First, the teaching background analysis 1. Content Analysis: This lesson is the PEP biology compulsory 3 “Steady State and Environment” Chapter 5, Section 1. In this section, we will clarify the structure of ecosystems mainly from the “components of ecosystems” and the “food chain and food webs”. Ecosystems are a part of the life-system hierarchy and are composed of biomes and the inorganic environment of their lives. Learning this lesson needs to make full use of the students’ existing knowledge and life experience. Through the analysis of a specific ecosystem, it is understood that the structure of the ecosystem consists of various components, and the phases between them