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

Description

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

Situation import

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?

Helmont's explanation:

1. Willow trees absorb a small amount of inorganic salts in the soil

2. Willow trees also absorb a lot of water

Think about it, discuss it

When the air becomes dirty it means:

What gas is missing? What's too much gas?

What about after the update?

Where did the less carbon dioxide go?

scientific experiments prove

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?

discuss:

1. Take a leaf from each experimental device A and B and treat it with iodine solution respectively. In which device do you think the leaves will not become blue?

2. Is there any relationship between photosynthesis and carbon dioxide?

Carbon dioxide is the raw material for photosynthesis

3. Which is the experimental group and which is the control group in this experiment?

A is the control group and B is the experimental group

Demonstration experiment

Pay attention and observe

1. Goldfish in experimental setup

Did the algae release bubbles?

Bubbles were released.

2. Things that are about to go out in the experimental device

Will the sanitary incense re-ignite after being inserted into the mouth of the pipe?

The sanitary incense that was about to go out burned again when it encountered the gas produced by hornwort, indicating that the gas released was oxygen.

3. Application of photosynthesis in agricultural production

Planting too thinly: waste caused by crops not fully utilizing the light per unit area.

Reasonable dense planting: allows the leaves of crops to fully receive light and thrive

Planting too densely: Plant leaves block each other, affecting the photosynthesis of plants.

practise

judge

(1) The raw materials for photosynthesis are water and carbon dioxide. ( )

(2) Every cell in a plant can perform photosynthesis. ( )

(3) The essence of photosynthesis is to create organic matter, release oxygen, and release all the energy in the organic matter. ( )

(4) Reasonable and dense planting can ensure that the leaves of the crops can fully receive light without blocking 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.

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"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 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..

"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: 2024-10-01

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

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