"Energy Flow and Material Cycle in Ecosystems" PPT

"Energy Flow and Material Cycle in Ecosystems" PPT

Part One: Situation Import

Information: The ecosystem relies on the sun to continuously provide energy, but the materials in the ecosystem are provided by the earth. Ask students to discuss: Why have the large amounts of substances required to maintain ecosystems, such as oxygen, water, nitrogen, carbon and many other substances, not been exhausted by life activities for hundreds of millions of years?

learning target

1. Through group collaborative exploration, clarify the characteristics of energy flow and material circulation in the ecosystem.

2. Combine life experience and observation to describe the source of energy in the ecosystem.

Energy flow and material cycle in the ecosystem PPT, part 2: theme exploration

Explore theme one

energy flow in ecosystems

1. Diagram of ecosystem energy flow

2. Energy Pyramid

3. Examples of different ways of energy flow

Thoughts and Discussions

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. Loss of energy: lost in the form of heat energy through respiration

5. The conversion form of energy: light energy → chemical energy → thermal energy

Explore theme two

Material cycles in ecosystems

1. The flow of energy in the ecosystem is accompanied by material cycles, and the carbon cycle is a very important material cycle.

2. Schematic diagram of carbon cycle in ecosystem

3. The process of carbon cycle

⑴Carbon dioxide is the main gas involved in the carbon cycle. Green plants use carbon dioxide and water to synthesize carbon-containing organic matter through photosynthesis and release oxygen.

⑵ Animals, plants and humans consume oxygen and produce carbon dioxide during respiration, and their residues are decomposed by microorganisms to release carbon dioxide.

⑶ Burning oil and coal also produces carbon dioxide, which participates in the carbon cycle. In this way, carbon dioxide and oxygen in nature are in balance.

Energy flow and material cycle in the ecosystem PPT, Part 3 content: Class summary

1. Energy flow in ecosystems

1. Unidirectional, irreversible

From producer→primary consumer→secondary consumer→tertiary consumer→…

2. Energy flow decreases step by step

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

2. Material circulation in the ecosystem

Substances such as carbon dioxide cycle repeatedly through ecosystems.

Energy flow and material circulation in the ecosystem PPT, Part 4: Standard training

1. Carnivores cannot be the trophic level in a food chain ( )

A． Fifth B. Second C. Third D. fourth

2. (2011·Neijiang Academic Examination) The energy flow in the ecosystem is accompanied by the material cycle. On the right is a schematic diagram of the ecosystem carbon cycle. Which of the following statements is wrong ( )

A.①Indicates the flow of energy from animals to plants

B.③Indicates the photosynthesis of plants

C.④ represents the respiration of animals

D.⑤ represents the decomposition of microorganisms

3. (2011·Changchun Academic Examination) Regarding maintaining the carbon and oxygen balance in the biosphere, which of the following practices is wrong ( )

A. Actively participate in tree planting activities in family forests

B. Burn crop straw to turn it into plant ash fertilizer

C. Qingming Festival changed from burning paper to offering flowers.

D. Try to walk or take the bus when traveling

4. The incorrect description of the food chain of rice → rat → snake → eagle is ( )

A. Rice is a producer B. Rat is a primary consumer

C. Snakes are secondary consumers D. Eagles belong to the third trophic level

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 courseware:

"Energy Flow and Material Cycle in Ecosystems" PPT courseware Part One Content: Learning Objectives: 1. Analyze energy flow and material cycle in ecosystems. 2. Name the carbon cycle in the ecosystem. Independent learning 1. Where does the energy of the ecosystem come from? ..