"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 7

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"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 7

Pre-study tips

1. What is an ecosystem? And give a few examples.

2. What two parts does the ecosystem consist of? And give a few examples.

3. What are the roles and functions of plants, animals, bacteria and fungi in the ecosystem?

4. What is the relationship between the “three” in the ecosystem?

5. How is the food chain formed in the ecosystem? Who starts the food chain?

6. How is the food web formed?

7. How do materials and energy flow in ecosystems? Give an example.

8. How to understand that the ecosystem has certain automatic adjustment capabilities? But if external interference exceeds a certain limit, what will be the consequences?

Analyze the biological phenomena shown in the following pictures. These phenomena are common in forests.

discuss

1. In the picture on the left, there are insect larvae inside the bark of the tree. What is the relationship between trees, insect larvae and woodpeckers?

2. Will the rotten tree stump pictured on the right eventually disappear?

3. What roles do plants, animals, and fungi play in ecosystems?

Ecosystem composition

plant

Role: Producer

Function: It can use light energy to produce organic matter, which provides nutrients for the survival of animals. Without producers, other organisms will lose the basis for survival.

Position: Producers are essential components of the ecosystem.

animal

Role: Consumer

Function: Cannot use light energy to create organic matter, directly or indirectly feed on plants to obtain life-sustaining substances and energy.

fungi, bacteria

Role: Decomposer

Function: It can decompose the remains of animals and plants into inorganic matter for reuse by green plants.

Status: Decomposers are also essential components of ecosystems.

food chain

Producer--Consumer....--Consumer

Notice:

1. The food chain does not include decomposers.

2. The food chain starts with producers.

3. The direction of the arrow points to the predator, indicating the flow of matter and energy in the ecosystem.

4. The food chain must end with the highest level consumer.

Different trophic levels determine the number of food chains

1. Animals are often at different trophic levels during the consumption process due to different food objects, which increases the number of food chains.

2. Watch "Eating"

3. Then write the food chain of "the mantis stalks the cicada, and the oriole stalks behind".

The ecosystem has certain automatic adjustment capabilities

If grass grows thickly, what will happen to the rabbit population in the short term? How long? Why?

In the short term, rabbits have enough food and their numbers will increase dramatically. After a while, the number will return to its original level.

Because the ecosystem has certain automatic adjustment capabilities, the number and proportion of various organisms in the ecosystem are relatively stable.

1. What are the consequences of overgrazing on grasslands?

Overgrazing prevents grass from regenerating in time, causing damage to the grassland food web, and in severe cases, desertification.

2. Why?

There are limits to the ability of an ecosystem to self-regulate.

practice

1. Among the following organisms, which ones are producers ( )

A. Rabbit B. Mushroom

C. Green algae D. Paramecium

2. Which of the following phenomena can reflect the relationship between consumers and producers ( )

A. Sheep eat grass B. Sheep drink water

C. Snake eats rat D. Fox eats rabbit

3. Which of the following does not belong to the ecosystem ( )

A. A group of wild ducks B. A river

C. a forest D. a pond

4. Which of the following represents the correct predator food chain ( )

A insect → frog → snake

B Grass → Insect → Frog → Fungus

C grass→insect→frog→snake

D Sun → Grass → Insect → Frog

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Update Time: 2024-11-25

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

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