"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 2

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"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 2

1. The process of green plant respiration

Let's take the germination of seeds as an example to discuss the process of plants decomposing organic matter to release energy through respiration.

think about it

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?

1. Three demonstration experiments

Demonstration experiment Ⅰ

Use two thermos bottles to hold seeds. Bottle A contains germinated seeds, and bottle B contains cooked seeds. Insert one thermometer into each and observe the temperature displayed by both thermometers after one day.

Phenomenon: The thermometer in bottle A shows a higher temperature than that in bottle B.

Reason: Seeds release energy during germination.

Demonstration experiment Ⅱ

The bottle contains the germinated seeds. The valve was closed at the beginning of the experiment. After a period of time, pour water into the bottle, open the valve, and let the gas in the bottle enter the test tube.

Carbon dioxide can turn clear limewater cloudy

Phenomenon: Lime water becomes turbid.

Reason: Seeds release carbon dioxide during germination.

Three conclusions

1. Energy changes occur during the germination process of seeds.

2. Seeds release carbon dioxide during germination. Water is produced during the germination process of seeds.

3. Seeds absorb oxygen during germination.

This change in organic matter occurs not only during seed germination but also within the interior of all cells.

Use of respiration

1. Promote respiration: loosen soil, drain water during waterlogging, etc.

2. Reduce respiration: dry and preserve food at low temperature, reduce temperature and oxygen to preserve fruits and vegetables, etc.

Organic matter in plants and animals is decomposed through cellular respiration.

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

3. Photosynthesis and carbon-oxygen balance in the biosphere

What is carbon-oxygen balance?

The relative balance between carbon dioxide and oxygen in the biosphere is called carbon-oxygen balance.

Green plants maintain carbon-oxygen balance through photosynthesis.

Discussion Discussion:

1. Will the carbon-oxygen balance be disrupted? Under what circumstances will it be broken? How should we prevent it?

1. Prohibit deforestation and afforestation.

2. Seek international cooperation to limit carbon dioxide emissions;

2. What impact has the increase in carbon dioxide had on the environment?

greenhouse effect

3. Contact your own living environment and talk about the reasons for the increase in carbon dioxide in the environment.

Burning too much coal, oil, and natural gas

4. As a member of the biosphere, what should we do to keep the air in our living environment always fresh?

Plant trees, protect vegetation, reject disposable chopsticks, etc.

4. The difference and connection between respiration and photosynthesis

2. The connection between photosynthesis and respiration

① Without photosynthesis, respiration cannot take place.

The organic matter decomposed by respiration is the product of photosynthesis;

The energy released by respiration is exactly the energy stored in organic matter by photosynthesis.

②Without respiration, photosynthesis cannot take place.

When plants perform photosynthesis, the energy required for the absorption of raw materials and transportation of products is released by respiration.

Respiration and photosynthesis are interdependent.

think about it

Why do radishes that have been stored for a long time become hollow? Why do corn and rice need to be dried before being put into warehouses?

Radish will respire and gradually decompose the organic matter stored in itself. Over time, it will appear "hollow".

Sun-dried corn and rice contain very little water, so the respiration will be significantly weakened, and less organic matter will be consumed, which is conducive to preserving the nutrients in them.

Classroom exercises

1. Which of the following does not perform respiration ( )

A. Germinated seeds b. ungerminated live seeds

C. Cooked vegetables D. fresh leaves

2. Which of the following statements about respiration is incorrect ( )

A. Respiration can provide energy for life activities

B． Respiration takes place mainly in mitochondria

C. Respiration usually absorbs oxygen

D. Respiration only occurs when there is no light

2. Explain the following daily life phenomena:

(1) Place fruits and vegetables in the refrigerator.

Storing fruits and vegetables in the refrigerator can inhibit the respiration of plants, and the organic matter in them will be decomposed less, thus extending the shelf life.

(2) Frequently loosen soil for plants.

Loosening the soil for plants helps the roots of the plants absorb oxygen and perform respiration. The energy released can be used by the roots to absorb inorganic salts in the soil, which is beneficial to the growth of the plants.

(3) It is a bad habit to put potted flowers in the bedroom at night.

Because flowers and plants mainly perform respiration at night, they will compete with people for indoor oxygen.

(4) Electric lights have been installed in the cellars where vegetables are stored, and farmers must hold lit candles in their hands when entering the cellars.

Vegetables stored in the cellar will also respire and consume the oxygen in the cellar. Farmers went down to the cellar with lit candles to help determine whether there was enough oxygen in the cellar to avoid death from suffocation.

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For more information about the PPT courseware "Respiration of Green Plants Green Plants and Carbon-Oxygen Balance in the Biosphere", please click the Respiration of Green Plants ppt Green Plants and Carbon-Oxygen Balance in the Biosphere ppt tag.

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Update Time: 2024-07-26

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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