"Green Plants and the Material Cycle of the Biosphere" PPT

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"Green Plants and the Material Cycle of the Biosphere" PPT

Part One: Basic Concepts

biosphere

The biosphere is the general term for all living things on earth and their living environment.

Material cycles in the biosphere

The material cycle in the biosphere refers to the recycling of materials.

Composition of air:

Nitrogen: 78%

Oxygen: 21%

Carbon dioxide: 0.03%

Green plants and the material cycle of the biosphere PPT, Part 2: Green plants and the oxygen cycle in the biosphere

A person inhales an average of 25 kilograms of air a day and consumes about 1 kilogram of oxygen. When the oxygen content in the air drops to 7%-8%, people will become comatose, suffocate, or even die. Someone once made this calculation: the total area of ​​leaves in 1 hectare of forest is about 50,000-70,000 square meters, which can absorb 150-500 kilograms of carbon dioxide and release 60-400 kilograms of oxygen every day. It can be seen how important the role of green plants is in maintaining carbon-oxygen balance.

think about it

1 According to the principle of oxygen cycle, what method is used to keep the air in the house fresh?

Open windows for ventilation, use fresheners, and place green plants during the day

2 According to the principle of oxygen circulation, what methods can be used to increase crop yields in plastic greenhouses?

Artificial carbon dioxide supplementation, fertilizer and water management, enhanced lighting, appropriate cooling at night, etc.

Green plants and the material cycle of the biosphere PPT, the third part: Transpiration

1. Concept:

The water absorbed by the roots of green plants is mainly lost to the air in the form of water vapor through the stomata of the leaves.

2. The process of transpiration:

The water absorbed by the roots of green plants is mainly lost to the air in the form of water vapor through the stomata of the leaves. This is transpiration.

Transpiration of green plants

Purpose: Describe the transpiration of green plants

Equipment: vigorous potted plants, clear plastic bags, string

Transpiration is very important to plants

1. It is the driving force for plants to absorb water and inorganic salts and transport them upward.

2. It can lower the temperature on the surface of plant leaves and avoid being burned by the sun.

Green plants and the material cycle of the biosphere PPT, part 4: data analysis

1. According to scientific calculations, the rainfall in a certain tropical rainforest is 1950 mm/year, and the transpiration is 1570 mm/year. Please calculate, what percentage of the rainfall does transpiration account for?

2. As the saying goes: “It’s good to enjoy the shade under a big tree”

According to the survey, on a scorching summer day, the temperature in green areas is 0.8°C lower than that in non-green areas, and the temperature in the forest is 1.3 to 3.2°C lower than the temperature in the courtyard.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, material cycle of green plants and biosphere PPT download, .PPT format;

For more information about the PPT courseware "The role of green plants in the biosphere, green plants and the material cycle of the biosphere", please click the "The role of green plants in the biosphere ppt green plants and the material cycle of the biosphere ppt" tag.

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Update Time: 2024-09-07

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 1 industry PPT template

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