"Maintaining Ecological Balance" Biology and Environment PPT Courseware 3

Description

"Maintaining Ecological Balance" Biology and Environment PPT Courseware 3

Ecological communities and their ecological balance

The organisms in a certain area in nature form a balanced and harmonious whole called a biome. If one part of a biological community is damaged, the entire ecosystem will be thrown out of balance.

teaching objectives

1. Tell us what a biome is. Explain and deduce the possible reasons for destroying the ecological balance and the possible harm.

2. Apply the knowledge you have learned to analyze and reason about the causes of sandstorms. Put forward your own suggestions for maintaining ecological balance,

Ecological balance on the grassland (eagle, rabbit, grass)

If there were fewer hawks, the number of rabbits would soon increase, and the grass would be eaten up;

If there are fewer rabbits, eagles will starve to death and grass will grow wildly, causing fires;

Without grass, rabbits and other livestock will starve and the land will become desertified.

material

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, foxes and wolves; omnivorous rabbits; there are also insects such as locusts and grasshoppers, as well as our favorite lark. bird. The Chinese medicinal material licorice and Nostoc, a rare specialty product exported to foreign countries, also grow there, but the local ecological balance is being destroyed.

think

As small masters in the 21st century, what should we do to maintain ecological balance and protect our homes?

Keywords: biology and environment teaching courseware, maintenance of ecological balance teaching courseware, textbook fifth grade science PPT courseware download, fifth grade science slide courseware download, biology and environment PPT courseware download, maintenance of ecological balance PPT courseware download, .PPT format ;

For more information about the "Biology and Environment Maintaining Ecological Balance" PPT courseware, please click the "Biology and Environment ppt Maintaining Ecological Balance" ppt tag.

"Maintaining Ecological Balance" Biology and Environment PPT download:

"Maintaining Ecological Balance" Biology and Environment PPT Download Part One Content: Collaborative exploration Taking eagles, rabbits, and grass as examples to explore the ecological balance of the grassland and the food relationship between the three. Imagine: What would happen if there were fewer eagles? ? If there are fewer rabbits,...

"Maintaining Ecological Balance" Biology and Environment PPT:

"Maintaining Ecological Balance" Biology and Environment PPT Part One: Eagles, Rabbits, and Grasses If we go to the grassland, we will find that eagles, rabbits, and grasses that rabbits like to eat live there. Let's draw the food chain between the hawk, rabbit and grass. Grass Rabbit Eagle If Eagle..

"Maintaining Ecological Balance" Biology and Environment PPT Courseware 4:

"Maintaining Ecological Balance" Biology and Environment PPT Courseware 4 Knowledge Points: This chain-link-like food relationship between organisms is called a food chain. The same kind of plant will be eaten by different animals, and the same kind of animal can eat different foods. The complex food relationship between living things forms...

File Info

Update Time: 2024-09-23

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

Preview