"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 5

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"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 5

1. What is an ecosystem?

Within a certain spatial range, the unified whole formed by organisms and the environment is called an ecosystem.

A forest, a piece of grassland, a piece of farmland, a lake, a river, or even a village or town can be regarded as an ecosystem.

2. Composition of ecosystem

1. There are insect larvae in the bark. What is the relationship between trees, insect larvae, and woodpeckers?

2. Will rotten tree stumps eventually disappear?

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

Food chain: In an ecosystem, the chain structure formed between different organisms due to the relationship between eating and first eating is called a food chain.

①First find the plant (producer) - the starting point of the food chain.

②Find animals that feed on the producer

③Look for natural enemies of herbivores (after finding one, look for the next one)

④Until no natural enemy animals can be found (——the end of the food chain)

⑤Marked arrows: starting point - ending point

3. The ecosystem has certain automatic adjustment capabilities

1. If the grass grows lush, how will the number of rabbits change 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.

2. 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.

3. Why?

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

4. Ecological balance

The number and proportion of various organisms in the ecosystem are always maintained in a relatively stable state. This phenomenon is called ecological balance.

The ecosystem has certain automatic adjustment capabilities, but this adjustment ability has certain limits. If external interference exceeds this limit, the ecosystem will be destroyed. (If people do not act according to ecological laws during production activities, the ecological balance will be destroyed.)

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

p24 Exercise 3

Some people like to eat frog meat, so some people capture wild frogs in large numbers. What are the consequences of this approach?

Predating frogs will cause harmful insects to lose their natural enemies and reproduce in large numbers, resulting in reduced food production.

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Update Time: 2024-09-09

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

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