"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 5

Description

"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 5

learning target

1. Understand the important role of green plants in maintaining carbon-oxygen balance;

2. Exercise your ability to design experiments independently;

3. Summarize the essence of photosynthesis;

4. Understand the application of photosynthesis in agricultural production.

Discussion and exchange

1. Please describe the production of gas by black algae immersed in water under light conditions.

2. What kind of experimental phenomenon occurs when a sanitary incense with sparks is inserted into a test tube?

3. Analyzing the experimental results, what is the experimental conclusion obtained?

In addition to organic matter, the products of photosynthesis of green plants also include oxygen.

think about it

1. Why do they burn out and die?

lack of oxygen

2. What did the lit candle, the white mouse, and the green plant get from each other?

Candles and mice get oxygen, green plants get carbon dioxide

3. What conclusions can be drawn from Priestley’s experiment?

Plants can renew air that has become polluted by burning candles or breathing animals. At the same time, the carbon dioxide emitted by candle burning or animal respiration is the raw material for photosynthesis of green plants.

group discussion:

1. What should be chosen as the variable for this experiment?

2. In addition to this variable, what should be the other conditions?

3. How to design a control group? Tip: Sodium hydroxide solution can absorb carbon dioxide in the air. (You can use a little 25% sodium hydroxide solution to absorb the carbon dioxide in the air)

Read textbook 129-130, discuss and think about the following questions

(1) Will the carbon-oxygen balance be broken? Under what circumstances will it break? How should we prevent it?

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

(3) What impact has the increase in carbon dioxide had on the environment?

Talk about harvest

learning target

1. Understand the important role of green plants in maintaining carbon-oxygen balance;

2. Exercise your ability to design experiments independently;

3. Summarize the essence of photosynthesis;

4. Give examples to illustrate the application of photosynthesis in agricultural production.

practice

1. When performing photosynthesis, the external conditions that plants do not need are ( )

A. carbon dioxide b. water c. High temperature D. Light

2. The essence of plant photosynthesis is ( )

A. Synthesize organic matter and release energy B. Synthesize organic matter and store energy

C. Decompose organic matter and store energy D. Decompose organic matter and release energy

3. To ensure that urban residents can get fresh oxygen every day, measures that can be taken are ( )

A. Build more high-rise buildings and live in high-rise buildings B. Expand living area

C. Beautify the environment D. Plant more lawns and more trees

4. Which of the following is not the meaning of photosynthesis ( )

A. Provide nutrients and food sources for animals, plants and people

B. Provide energy sources for animals, plants and people

C. Provide oxygen sources for animals, plants and people to breathe

D. Provide a source of carbon dioxide for animals, plants and people to breathe.

5. In the experiment of "examining the gases released by photosynthesis", what caused the wood sticks with sparks to burn violently?

A. Oxygen B. Carbon dioxide

C. Oxygen and carbon dioxide D. Nitrogen

extracurricular extension

The method of applying carbon dioxide to crops in fields and greenhouses to increase crop yields is called air fertilizer, and carbon dioxide is called "aerial fertilizer."

Specific operation method

⑴ Apply more organic fertilizer;

⑵ Directly spray carbon dioxide stored in cylinders;

(3) Light the briquette stove.

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For more information about the PPT courseware "Carbon-Oxygen Balance in Green Plants and the Biosphere, Photosynthesis Absorbs Carbon Dioxide and Releases Oxygen", please click the Carbon-Oxygen Balance in Green Plants and the Biosphere ppt Photosynthesis Absorbs Carbon Dioxide and Releases Oxygen ppt tag.

"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 7:

"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 7 Learning objectives 1. Knowledge and skills: 1. What are the raw materials and products of photosynthesis? 2. What is the concept of photosynthesis? 3.The principle of photosynthesis lies in...

"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 6:

"Photosynthesis Absorbs Carbon Dioxide and Releases Oxygen" PPT Courseware 6 on Carbon-Oxygen Balance in Green Plants and the Biosphere Scenario introduction information: Belgian scientist Helmont once conducted a famous experiment in which he planted a 2.5-kg willow sapling in a wooden barrel. , with rain every day...

"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 4:

"Photosynthesis Absorbs Carbon Dioxide and Releases Oxygen" PPT Courseware 4 on Carbon-Oxygen Balance in Green Plants and the Biosphere Data Analysis A person inhales an average of 25 kilograms of air a day (containing about 5 kilograms of oxygen) and consumes about 1 kilogram of oxygen (excluding Destroyed by animal respiration and combustion...

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Update Time: 2024-11-28

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

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