"Respiration of Green Plants" PPT courseware

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"Respiration of Green Plants" PPT courseware

Part One: Situation Import

Some people believe that green plants absorb carbon dioxide and release oxygen through photosynthesis, which can renew the air in the room, so they place many pots of green plants in the bedroom.

Do you think this approach is scientific? Why?

learning target

1. Know the raw materials and products of respiration.

2. Describe the process of respiration.

3. Know that respiration is a common characteristic of living things.

4. Understand the role of green plants in maintaining the carbon-oxygen balance of the biosphere.

Respiration of green plants PPT, part 2: theme exploration

Explore theme one

The process of green plant respiration

Ask students to study relevant content on their own and think about the following questions:

1. Complete the discussion questions in conjunction with the "Demonstration Experiment".

2. What is respiration?

3. How to express respiration with formula?

Demonstration experiment 1: Does the energy of seeds change during the germination process?

A: Germinated seeds - the thermometer shows a high reading

B: Cooked seeds - the thermometer shows a low reading

Exchange and discussion

Do seeds undergo energy changes during germination?

During the germination process of seeds, the organic matter in them changes and releases energy. Part of the energy is used for seed germination, and part of the energy is lost in the form of heat energy.

Demonstration experiment 2: What gases are released during the germination process of seeds?

1. What happens to the clarified limewater?

become turbid

2. What gas does this experiment illustrate that seeds release during germination?

Carbon dioxide (it is the property of carbon dioxide to make clear limewater turbid)

3. Where does carbon dioxide come from? organic matter in seeds

Demonstration experiment 3: What gases are consumed during the decomposition of organic matter?

1. Phenomenon:

A bottle (germinating seed) - extinguished

Yibo (cooked seeds) - burning

2. Why do candles burn differently in bottles A and B?

Bottle A contains germinated seeds. The seeds consume oxygen when they germinate. Bottle A lacks oxygen, and candles need oxygen to burn, so the candle in bottle A goes out. Bottle B contains cooked seeds, which do not germinate and do not consume oxygen. So it can continue to burn

burn. This shows that organic matter consumes oxygen during the decomposition process.

Explore theme two

Respiration is a common feature of living things

Invite students to self-study relevant content and think: Why is respiration a common characteristic of living things?

The energy required for the life activities of plants and animals comes from the decomposition of organic matter, that is, through cellular respiration.

Respiration is a common characteristic of living things. Its essence is the decomposition of organic matter and the release of energy.

Explore theme three

The role of green plants in maintaining the carbon-oxygen balance of the biosphere

Through photosynthesis, green plants can continuously consume carbon dioxide in the atmosphere and emit oxygen into the atmosphere, playing an important role in maintaining the relative balance of carbon dioxide and oxygen in the biosphere (referred to as carbon-oxygen balance).

How to maintain the carbon-oxygen balance in the biosphere?

On the one hand, we should protect existing forests and vigorously plant trees to give full play to the functions of green plants in consuming carbon dioxide and producing oxygen;

On the other hand, international cooperation must be carried out to reduce carbon dioxide emissions.

Think about it:

As a member of the biosphere, for the sake of a better tomorrow for mankind, what should you do in the face of green protection and low carbon?

Respiration of green plants PPT, part three: training to meet standards

1. The reason why sweet potatoes and cabbage will become hot after being piled up for a long time is ( )

A. Photosynthesis produces heat B. Transpiration produces heat

C. Respiration produces heat D. Both are possible

2. In agricultural production, in order to facilitate plant respiration, the measures often taken are ( )

A. Use a large amount of organic fertilizers B. Use a large amount of inorganic fertilizers

C. Water a lot D. Till and loosen the soil

3. The part where plants carry out respiration is ( )

A.Green part B.Leaves

C. Seeds D. Living parts of plants

4. What is the main reason why farmland and flower pots should be loosened frequently?

Frequently loosening the soil can provide sufficient oxygen for the roots. Keep enough air in the soil to encourage root respiration.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, respiration of green plants PPT download, .PPT format;

For more information about the PPT courseware "Photosynthesis and Respiration of Green Plants Respiration of Green Plants", please click the "Photosynthesis and Respiration of Green Plants ppt Respiration of Green Plants ppt" tag.

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Update Time: 2024-11-17

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

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