"The Role of Animals in the Biosphere" PPT

"The Role of Animals in the Biosphere" PPT

Part One: Thinking Questions:

What role do green plants play in the biosphere?

Green plants can use light energy through chloroplasts to synthesize inorganic substances into organic substances that store energy. They are producers in the biosphere.

What role do animals play in the biosphere?

Ask students to think about:

How do animals obtain the materials and energy necessary for life?

From the perspective of animals obtaining nutrition, animals must feed on green plants directly or indirectly and maintain their lives by consuming organic matter synthesized by green plants. Therefore, animals are consumers in the biosphere.

The role of animals in the biosphere PPT, part 2: Animals are consumers in the biosphere

Thinking: Do animals feed directly on green plants?

Herbivore

Feed directly on green plants

carnivore

feed on other animals

Omnivores

Can eat both plants and animals

The role of animals in the biosphere PPT, part 3: Animals are components of the food chain structure

The concept of food chain and food web:

In a certain natural area, there are complex relationships between prey and prey among various organisms, and this nutritional relationship forms a food chain.

In a certain natural area, multiple food chains intersect with each other to form a network structure called a food web.

Activity: Building food chains and food webs

Consider two questions during the activity:

1. Which is the longest food chain and how many links does it consist of?

2. What would happen to the food web if there were no certain animals?

The role of animals in the biosphere PPT, part 4: thinking about issues

Do you think that in natural ecosystems, the number of various animals can grow indefinitely? Why?

Answer: No, when the number of a certain animal increases, the number of animals that feed on that animal will also increase, thus limiting the number of such animals. In addition, animals are also limited by the space and food required for survival, and their number cannot be Unlimited growth.

Do you think humans can kill certain animals at will? Why?

cannot.

Humans cannot kill certain animals at will, because there are direct and indirect nutritional relationships between various organisms in the ecosystem. When an animal becomes extinct, it will cause the interruption of the related food chain or the destruction of certain organisms controlled by the species. Proliferate in large numbers and lose ecological balance.

Ecological balance: refers to the fact that the number and proportion of various organisms are always maintained in a relatively stable state.

It can be concluded from the above two questions that

In a stable ecosystem, organisms in any link of the food chain are interdependent and restricted. Once a new species is introduced or the original species becomes extinct, it will destroy the previously established balanced relationship. Causes damage to the original food chain, causing the food chain in the biosphere to lose balance and harming the original species. Therefore, the introduction of a new alien species must be cautious, and at the same time, the extinction of the species must be prevented to maintain biological diversity.

The role of animals in the biosphere PPT, Part 5: The role of animals in nature

1 Can promote the material cycle of the ecosystem

As consumers, animals feed on plants directly or indirectly. These organic matter are decomposed in the animal's body to release energy, and also produce carbon dioxide, urine and other substances. These substances can be used by producers, and the feces excreted by animals and animals After the remains are decomposed by decomposers, they can also release substances such as carbon dioxide and inorganic salts. It can be seen that animals can promote the material cycle of the ecosystem.

2 Can help plant pollination

3. Can help plants spread fruits and seeds

4. It can improve the soil and help plants grow better.

5 plays an important role in maintaining ecological balance

PPT on the role of animals in the biosphere, part 6: training ground

1. Animals serve as ( ) in the biosphere

A) Decomposer B) Consumer

C) producer D) primary consumer

2. In a farmland, voles eat crops, snakes eat voles, and eagles eat snakes. These creatures together constitute ( )

A) food web B) food chain

C) Producer D) Ecosystem

3. Animals can help plants spread seeds, which is beneficial to plants ( )

A) Expand the distribution range of plants

B) Avoid bad environments

C) perform photosynthesis

D) carry out respiration

Keywords: Beijing Normal University version of the eighth grade biology PPT courseware for the first volume is free to download, the role of animals in the biosphere PPT download, .PPT format;

For more information about the PPT courseware "Animals in the Biosphere and the Role of Animals in the Biosphere", please click on the Animals in the Biosphere ppt and the Role of Animals in the Biosphere ppt tags.

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