"Energy Flow and Material Cycle in Ecosystems" PPT courseware

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"Energy Flow and Material Cycle in Ecosystems" PPT courseware

Part One Content: Learning Objectives:

1. Analyze the energy flow and material cycle in the ecosystem.

2. Name the carbon cycle in the ecosystem.

Self-learning

1. Where does the energy of the ecosystem come from? How to enter the biological world?

Solar energy, producer of photosynthesis

2. Where does the energy flow of the ecosystem begin (starting point)?

Start with producer fixed solar

3. How to calculate the total energy flowing through the ecosystem?

The total amount of solar energy fixed by the ecosystem’s producers

4. Paths (channels) of energy flow:

food chain and food web

5. Loss of energy:

Dissipated as heat energy through respiration

6. Transformation form of energy:

Light energy → chemical energy → thermal energy

Energy flow and material circulation in ecosystems PPT, part 2: Characteristics of energy flow:

(1) Unidirectional and irreversible.

From the first trophic level → the second trophic level → the third trophic level → the fourth trophic level →…

(2) Energy flow decreases step by step

The transfer efficiency is generally only about 10% (10%-20%)

Energy flow and material circulation in the ecosystem PPT, part 3: thinking expansion

1. Why is the price of meat products higher than that of cabbage?

2. Can there be infinitely many trophic levels in the food chain?

In addition to energy flow, what are the other characteristics of an ecosystem?

The carbon cycle is one of the material cycles in the ecosystem. How does the carbon cycle proceed? What does it have to do with?

Generalize the concept of material cycles in ecosystems?

The material cycle of ecosystems is global, and this material cycle is also called biogeochemical cycle (biogeochemical cycle).

Energy flow and material circulation in ecosystems PPT, Part 4: Exercises

1. According to the investigation, the trophic structure of a certain river ecosystem has four trophic levels (represented by a, b, c, d). It has been determined that the energy flowing through these four trophic levels in a year is:

The primary consumer in this ecosystem is ( )

A, a; B, b; C, c; D, d.

2.The total energy flowing through an ecosystem is:

A. All the solar energy that hits the system;

B. The energy in all producers, consumers, and decomposers in the ecosystem;

C. The energy in the bodies of producers in the ecosystem;

D. The energy fixed by the producers in the ecosystem;

3. Within a certain period of time, the fixed energy value of all producers in an ecosystem is a, the energy obtained by all consumers is b, and the energy obtained by all decomposers is c, then the energy value between a, b, and c The relationship is:

A.a=b+c B.a>b+c

C.a

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware free download, energy flow and material cycle in the ecosystem PPT download, .PPT format;

For more information about the PPT courseware "Energy Flow and Material Cycle in Ecosystems and Ecosystems", please click the Ecosystem ppt Energy Flow and Material Cycle in Ecosystems ppt tag.

"Energy Flow and Material Cycle in Ecosystems" PPT:

"Energy Flow and Material Cycle in Ecosystems" PPT Part One: Situation Introduction Materials: Ecosystems rely on the sun to continuously provide energy, but the materials in the ecosystem are all provided by the earth. Invite students to discuss: Why does maintaining an ecosystem...

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Update Time: 2024-10-02

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

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