"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 7

Description

"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 7

1. Scope of the biosphere

Biosphere concept: The sum of all living things on the earth and their environment is called the biosphere.

1. Thickness of the biosphere: about 20 kilometers

2. Scope of the biosphere: the bottom of the atmosphere, most of the hydrosphere, and the surface of the lithosphere

atmosphere

1. The composition of the atmosphere: It is composed of various gases.

2. Living organisms: mainly insects and birds that can fly, as well as microorganisms such as bacteria.

Hydrosphere

1. The composition of the hydrosphere: all oceans, rivers and lakes on the earth.

2. Living Creatures: There are living things almost everywhere. (Where do you mostly live?)

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1. The composition of the atmosphere: it is the solid part of the earth's surface.

2. Living creatures: It is the "footing point" of all terrestrial creatures.

2. Diverse Ecosystems

grassland ecosystem

Distribution: Arid areas.

Biological characteristics: Mainly herbaceous plants, lack of tall trees, and fewer species of animals and plants than forest ecosystems.

Function: maintain water and soil, prevent wind and sand fixation; important production base for animal husbandry.

wetland ecosystem

Formation: Formed under watery and over-humid conditions, swamps are a typical wetland ecosystem.

Biological characteristics: Swamp plants dominate, and there are many species of animals and plants.

Function: Purify water quality, store floods and resist drought.

The wetland ecosystem is known as the "kidney of the earth".

3. The biosphere is a unified whole

1. Do various ecosystems exist in isolation?

2. Is it related to other ecosystems? Talk about your opinions.

Every ecosystem is connected to other surrounding ecosystems in many ways.

1. Abiotic factors

Sunlight, atmosphere, water.

2. Regional relationship

Yellow River, Yangtze River

3. Organisms in the ecosystem

Tiny organisms, pollen, and seeds can move with the atmosphere. Animal movement, human activity.

summary

The biosphere is a unified whole, the largest ecosystem on Earth and the home of all living things. Once human activities destroy the biosphere and make it impossible to recover, then the creatures on the earth, including us humans, will not be able to survive. Therefore, we must protect the biosphere.

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Update Time: 2024-11-18

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

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