"Ecosystem Composition" PPT

Description

"Ecosystem Composition" PPT

Part One: Objectives of this Section

Outline the components of an ecosystem

Overview of food chains and food webs in ecosystems

Give examples of certain harmful substances that accumulate through the food chain

Putting what the students said together, the above-mentioned pond and the sun together form a whole, that is, an ecosystem.

The composition of ecosystem PPT, part 2: components of ecosystem

The role of each ingredient

Abiotic components, sites of biological activity

Producer converts and stores energy

Consumers transfer matter and energy

Decomposer Decomposes organic matter enabling reuse

Consolidation exercises

1. In European and American countries, a crystal ball-like ecological ball is popular as a home decoration. The ball is sealed and contains water and two or three small fish. There are corals, sand, etc. at the bottom, and some algae growing there. The wonderful thing is that the small fish and algae inside are alive all year round. Excuse me:

(1) This ecological ball should be placed in a place with __________.

(2) In addition to small fish (or shrimp) and algae, this ecosystem should also include ______________ and _________.

(3)The reason why the small fish and algae in this ball can survive all year round is __________________.

PPT on the composition of ecosystems, part 3: food chains and food webs in ecosystems

Definition: A chain of organisms connected to each other through feeding relationships.

Question: What is a food chain? What is a food web? What is the relationship between the two?

Self-study textbook P88, the first natural paragraph, understands food chains and food webs and their relationship.

discuss

1. What is the starting organism in each food chain? What components are part of an ecosystem? Where does its energy come from?

2. What components of the ecosystem do the animals in each food chain belong to? How can they be divided into different categories based on the food they eat? Where in the food chain are they located?

Summarize

1. The food chain usually starts with a green plant

2. Organisms located in the second link of the food chain are usually herbivores.

3. Most of the organisms in other links in the food chain are carnivores.

4. The direction of the arrow represents the flow of matter and energy.

PPT on the composition of ecosystems, part 4: biological enrichment and its impact

After a person eats fish containing heavy metals, the body also contains heavy metals, but it is difficult for the human body to decompose these substances. Therefore, as the amount of heavy metal-containing food eaten increases, the content of heavy metals in the human body also increases. This is biological Enrichment.

1. The following figure represents the food web of a temperate grassland ecosystem in equilibrium. Please answer according to the figure:

(1) The food web of this ecosystem includes _____ food chains.

(2) The one with the largest number of individuals is ___.

(3) In this ecosystem, the relationship between rabbits and grass is ___, and the relationship between rabbits, insects and mice is ___.

(4) If the number of grasses is greatly reduced due to natural disasters, the number of eagles will ___.

(5) After stopping hunting, after several years of recovery, the number of wolves increased significantly and the grassland vegetation also recovered. This shows that the ecosystem has the ability to ______. Generally speaking, the more types and numbers of organisms, the more ______ the ecosystem structure, the stronger this ability, and the easier it is to ______ ecological balance.

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware free download, composition of ecosystem PPT download, .PPT format;

For more information about the PPT courseware "The Composition of Ecosystems and Ecosystems", please click the Ecosystem PPT Composition of Ecosystems PPT tab.

"The Composition of Ecosystems" PPT courseware:

"The Composition of Ecosystems" PPT courseware Part 1: Exploration Topic 1 Components of Ecosystems 1. What is an ecosystem? In a certain area, the unified whole formed by organisms and the environment is called an ecosystem. Ecosystems range in size from large to small, ranging from...

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Update Time: 2024-10-01

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 1 industry PPT template

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