"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 4

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"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 4

1. Observe the respiration phenomenon of plants

Demonstration experiment 1

1. Experimental materials

Soybeans cooked and cooled to room temperature

Soybeans germinated for 24 hours

2. Experimental tools and reagents

Glass bottles, corks, candles

Think seriously

1. Please tell us the role of cooked seeds in the demonstration experiment.

(Contrast effect)

2. What phenomena did you observe in the experiment?

(The candle containing the germinated seeds goes out)

3. Analyzing the experimental phenomena, what conclusion did you draw?

(Germinating seeds need to absorb oxygen when breathing)

respiration

The process in which cells use oxygen to decompose organic matter into carbon dioxide and water and release the energy stored in the organic matter to supply the needs of life activities is called respiration.

formula:

Organic matter + oxygen decomposition carbon dioxide + water + energy

Location: Respiration occurs in mitochondria

The meaning of respiration

The energy required for various life activities of plants comes from respiration.

2. Respiration is a common characteristic of living things

Apply what you learn

1. Young leaves have stronger respiration than old leaves, and flowers have stronger respiration than leaves. Why?

Young leaves have more vigorous life activities than old leaves, and flowers have more vigorous life activities than leaves.

2. Why do we need to loosen the soil frequently when planting flowers or crops?

Frequent loosening of the soil provides sufficient oxygen to the roots.

3. Why do sweet potatoes and cabbage get hot after being piled up for a long time? Why do cellars for storing sweet potatoes and cabbage have to have ventilation holes?

Sweet potatoes and cabbage continuously respire and generate a lot of heat. If there are no ventilation holes and no heat dissipation, the temperature in the cellar will rise, causing sweet potatoes and cabbage to rot.

4. Electric lights have been installed in the cellar where vegetables are stored. Why do farmers still hold lit candles in their hands when entering the cellar?

Lighted candles can test whether there is oxygen in the cellar, preventing plant respiration in the cellar from consuming too much oxygen and suffocating people if they enter.

5. Why do radishes that have been stored for a long time become hollow?

Respiration consumes large amounts of organic matter.

6. Why do corn and rice need to be dried before being put into warehouses?

Reduce moisture and reduce respiration

discuss

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

Burning too much coal, oil, and natural gas

Seek international cooperation to limit carbon dioxide emissions;

Indiscriminate deforestation and afforestation are prohibited.

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

greenhouse effect

3. 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

Sharing rides, walking, cycling

Reasoning process:

1. The amount of organic matter produced by melons in the two places through photosynthesis is basically the same.

2. The melons in Land A consume less organic matter than those in Land B.

3. The respiration of melons from place A is weaker than that of melons from place B.

4. Because the night temperature in site A is lower than that in site B, it shows that the ambient temperature has an impact on the respiration of plants. Within a certain range, the higher the ambient temperature, the stronger the respiration of plants.

test you

1. The part of the plant that performs suction is ( )

A. Only in leaves B. Only in germinated seeds

C. Only in the root system D. Can be carried out in all living cells

2. The time it takes for plants to perform respiration is ( )

A.Only during the day B.Only under the light

C. During the day and night D. Only at night

3. If you water the flowers too frequently, the flower soil always contains a lot of water, which will cause the roots to rot and the plants to die. The reason is. ( )

A. Too much water and the root hairs cannot absorb it

B． Too much water and the roots cannot breathe

C. Too much water allows cells to multiply, causing roots to rot.

D. Roots absorb too much water and die

4. Plants inhale carbon dioxide and release oxygen during the day, and inhale oxygen and exhale carbon dioxide at night. This is because ( )

A. Photosynthesis occurs in sunlight and respiration stops

B． Photosynthesis is stronger than respiration

C. Respiration occurs at night and photosynthesis ceases at night

D. Leaves perform photosynthesis but not respiration

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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: 2024-11-16

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

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