| Category | Format | Size |
|---|---|---|
| Qingdao Edition Fourth Grade Science Volume 2 | pptx | 6 MB |
"The Closely Connected Biological World" PPT
Description
"The Closely Connected Biological World" PPT
Part One: Food Chain
In an ecological environment, the food connection between various organisms is called a food chain.
In the food chain, plants can produce the nutrients they need and are called producers; animals cannot produce nutrients themselves. They directly or indirectly use the nutrients produced by producers and are called consumers.
Level 1: Is the following food chain correct? Why?
Vegetables←Aphids←Seven-spotted ladybugs
Green vegetables→Aphids→Seven-spotted ladybugs
Tip: The direction of the arrow in the food chain should point to the strongest.
Level 2: Is the following food chain correct? Why?
field mouse → snake → eagle
Grain → Vole → Snake → Eagle
Tip: The food chain generally starts with plants and ends with carnivores.
Level 3: Among the creatures on the grassland, who is the producer?
Who are consumers?
Closely connected biological world PPT, part 2 content: clever tricks
1. Greenhouse vegetables have attracted aphids. What are you going to do in order to produce pollution-free green and high-quality vegetables?
The natural enemy of aphids is the seven-spotted ladybug, and we can control them with insects.
2. Pine caterpillars eat pine trees. A large number of pine caterpillars have brought disaster to the pine forest. What measures do you think are the best to take?
Closely connected biological world PPT, the third part: homework
Work requirements:
1. Group work: Collect information. Please choose at least one of the ocean, forest, and pond ecosystems to study and draw a food web.
2. Read relevant stories and cases after class.
Story 1. Release 500 million Zhou's wasps as a "biological weapon" to control the American white moth.
Story 2. "Dung Beetle" went abroad.
3. Whole class homework: Check the information to understand the causes of soil desertification and design a soil protection plan.
Keywords: Qingdao edition fourth grade science PPT courseware for the second volume free download, closely related biological world PPT download, .PPT format;
For more information about the PPT courseware "The Closely Connected Biological World", please click the Closely Connected Biological World PPT tab.
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Update Time: 2024-06-30
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