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"Photosynthesis absorbs carbon dioxide and releases oxygen" PPT courseware on carbon-oxygen balance in green plants and the biosphere
Information: Belgian scientist Helmont once conducted a famous experiment. He planted a 2.5-kg willow sapling in a wooden barrel and irrigated it with rainwater every day. After 5 years, the mass of the willow tree increased by more than 80 kilograms, while the soil only decreased by less than 100 grams. Helmont believes that this is because the willow tree not only absorbs a small amount of inorganic salts in the soil, but also absorbs a large amount of water. Water is the raw material for synthesizing organic matter in the willow tree.
Think about it, did he ignore other factors?
learning target
1. Understand the raw materials and products of photosynthesis, and understand the essence of photosynthesis.
2. Use experimental methods to independently design and complete the research activity "Is carbon dioxide an essential raw material for photosynthesis?"
3. Give examples of the application of photosynthesis principles in agricultural production.
Photosynthesis uses carbon dioxide as a raw material
Ask students to study the relevant content on their own and think about it based on the picture: What did Priestley's experiment illustrate?
The burning of candles or the respiration of animals will emit carbon dioxide and consume oxygen, while the photosynthesis of plants can release oxygen and consume carbon dioxide. In addition to water, carbon dioxide is also the raw material for photosynthesis of green plants. Is carbon dioxide really a necessary raw material for photosynthesis of green plants?
Explore: Is carbon dioxide a necessary raw material for photosynthesis?
Please design an experiment to explore whether carbon dioxide is really a necessary raw material for photosynthesis. After the research is completed, write a research report.
Photosynthesis also produces oxygen
Ask students to self-study relevant content and think about it in combination with the "demonstration experiment": What gases are produced by photosynthesis?
Application of photosynthesis principles in agricultural production
Ask students to study relevant content on their own and give examples of the application of photosynthesis in agricultural production.
Reasonable dense planting: allows the leaves of crops to fully receive light and thrive.
Planting too thinly: waste caused by crops not making full use of the light per unit area;
Planting too densely affects the photosynthesis of plants because the plant leaves block each other.
Standard training
1.The essence of photosynthesis is ()
A. Synthesize organic matter and release energy
B. Synthesize organic matter and store energy
C. Decompose organic matter and release energy
D. Decompose organic matter and store energy
2. When cultivating crops in a greenhouse, experienced people improve crop yields by changing some environmental conditions. The following conditions suitable for greenhouse changes are ( )
A.Light intensity B.Temperature
C. Carbon dioxide content D. Nitrogen content
3. Distinguish real and fake aquatic plants: Among the two goldfish tanks as shown in the picture, one tank contains real aquatic plants, and the other tank contains plastic simulated aquatic plants. Please observe and identify which one is real and which one is fake, and say Tell me your reasons. Real and fake aquatic plants
(1) The aquatic plants in tank A are _____, and the reason is _______________.
(2) The aquatic plants in tank B are _____, and the reason is _______________.
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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 5:
"Photosynthesis Absorbs Carbon Dioxide and Releases Oxygen" Green Plants and Carbon-Oxygen Balance in the Biosphere PPT Courseware 5 Learning Objectives 1. Understand the important role of green plants in maintaining carbon-oxygen balance; 2. Exercise your ability to independently design experiments; 3 , summarize photosynthesis..