"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 5

Description

"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 5

1. The process of green plant respiration

Demonstration experiment 1

Discussion: Why are germinated seeds warmer than cooked seeds?

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

Conclusion: Energy is released when organic matter decomposes

Demonstration experiment 2

Thoughts: Why does clear limewater turn cloudy?

Seeds release carbon dioxide when they germinate

Conclusion: Carbon dioxide and water are released when organic matter decomposes.

Demonstration experiment 3

Phenomenon: The flame of the candle in bottle A is _____, and the candle in bottle B is still _____.

Thinking: Why does candle A burn out quickly?

Conclusion: The decomposition of organic matter requires the consumption of oxygen.

2. Respiration is a common characteristic of living things

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

Any living cell is constantly respiration. Once respiration stops, it means the end of life.

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

reasoning

Two places A and B produce the same kind of melon. The melons in place A have a higher sugar content than those in place B. After investigation, during the melon growing season, the lighting conditions and cultivation measures in places A and B are basically the same, but the temperature conditions are quite different. See the table below for details:

Please analyze based on the above information: What effect does ambient temperature have on the strength of respiration? Please write down the reasoning process in order, communicate with the students around you, and think about whether there is anything loose in your reasoning process?

Reasoning process:

1. Reasoning purpose: The influence of ambient temperature on the strength of respiration

2. Reasoning process:

Because it is the same kind of melon, the lighting conditions and cultivation methods in two places are basically the same, and the daytime temperature is also the same, so

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

Because the sugar content of melons in place A is higher than that in place B, so

Melons from site A consume less organic matter than those from site B.

Because only respiration consumes organic matter in living organisms, so

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

Because the night temperature in place A is lower than that in place B, it means

Environmental temperature affects plant respiration

3. Inference conclusion:

Within a certain range, the higher the ambient temperature, the stronger the respiration of plants

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 and prevent plant respiration in the cellar from consuming too much oxygen and suffocating people if they enter.

5. Why should you put fruits and vegetables in the refrigerator?

Respiration is weakened by hypothermia.

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

Respiration consumes large amounts of organic matter.

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

Reduce moisture and reduce respiration

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.

discuss

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

1. Seek international cooperation to limit carbon dioxide emissions;

2. Prohibit deforestation and afforestation.

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, and reject disposable chopsticks.

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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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