"Maintaining Ecological Balance" Biology and Environment PPT Download

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"Maintaining Ecological Balance" Biology and Environment PPT Download

Part One Content: Collaborative Exploration

Take eagle, rabbit and grass as examples to explore the ecological balance on the grassland

The food relationship among the three

Imagine this:

What would happen if there were fewer eagles?

What would happen if there were fewer rabbits?

What will happen if there is less grass?

If there are fewer hawks, rabbits will multiply in large numbers, and the grass will be eaten up quickly before it has time to grow. A large number of rabbits will starve to death, and the grass may grow again, rebalancing over a long period of time. Or because there is no vegetation, serious water and soil erosion will occur, the climate will deteriorate, precipitation will decrease, and it will be more difficult for plants to grow, forming a Gobi Desert where rabbits and eagles will die and migrate.

If there are fewer rabbits, a large number of eagles will starve to death, the grass will grow wildly, and the vegetation will be unreasonable, which may cause grassland fires...

If there is less grass, there will be fewer rabbits, eagles will starve to death, and the grasslands will gradually become desert...

Maintaining ecological balance PPT, part 2: information reading

In the north of our country, there are many semi-arid grassland areas. In addition to cattle and sheep grazed by humans, there are also carnivorous falcons (sǔn), foxes and wolves; omnivorous rabbits; as well as locusts, grasshoppers and other insects, as well as us. Favorite lark. The Chinese herbal medicine licorice and the precious specialty vegetables sold abroad also grow there, but the local ecological balance is being destroyed.

Licorice: a leguminous plant whose roots and rhizomes are used as medicine and are the most commonly used medicines in clinical practice. In addition to medicinal uses, licorice is also widely used as a pastry additive in food.

Nostoc is a kind of algae, named after its shape like hair, and has high nutritional value. It grows in dry grasslands, deserts, flat wastelands and low mountains and hills. In June 2000, it was listed as a first-class protected plant by the country.

Falcon: a seasonal migratory bird, a large raptor that mainly feeds on birds and small animals. It is a first-level national key protected animal in China.

Maintaining ecological balance PPT, part three content: Class summary

1. The organisms in a certain area in nature form a balanced and harmonious whole, called an ecosystem.

2. If part of the biological system is damaged, the entire ecosystem will be out of balance.

Maintaining ecological balance PPT, part 4: in-class training

1. Fill in the blanks

1. The organisms in a certain area of ​​nature form a balanced and harmonious whole, which is called ( ).

2. ( ) is a kind of bad weather that pollutes the environment and harms our lives.

3. A forest, a meadow, a lake, or an ocean can be regarded as a ( ).

Maintaining ecological balance PPT, Part 5: After-school homework

Collect relevant information on environmental protection.

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Update Time: 2024-11-22

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