"Food Chains and Food Webs" Biology and Environment PPT Download

"Food Chains and Food Webs" Biology and Environment PPT Download
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"Food Chains and Food Webs" Biology and Environment PPT Download

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"Food Chains and Food Webs" Biology and Environment PPT Download

Part 1: Who is eaten by whom?

Food is one of the most important needs for animals to survive. Tell me, what kind of creatures might be in a cluster of flowers?

We found the following creatures in a cluster of flowers. Let’s discuss them:

What do the little animals here eat?

What kind of food relationship do they have?

rose→aphid→ladybug→bird

Grass → aphid → ladybug → bird

Fallen leaves→earthworms→birds

The organisms in the food chain that can produce their own food are called producers, and the organisms that directly or indirectly consume food produced by others are called consumers.

The food chain usually starts with green plants and ends with ferocious carnivores.

This link-like food relationship between organisms is called a food chain.

Food chain and food web PPT, part 2: Food web in the field

There are many creatures in the fields, and there are complex food relationships among these creatures. Looking for it, what food relationships can we find among them? Try using arrows to show the food relationships between them.

Tip: If there is already an arrow connecting two organisms, no arrows will be drawn when drawing the second food chain.

The same plant will be eaten by different animals, and the same animal can also eat a variety of foods. This complex food relationship between organisms forms a network structure called a food web.

If the abundance of one organism in a food web changes, what impact will it have on other organisms?

In the 1950s, there was a campaign to eliminate sparrows as one of the four pests in rural my country. Later, people discovered that in the years after the sparrows were hunted in large numbers, serious insect pests occurred, which greatly reduced food production. The farmer uncle doesn't understand why? Who can explain to the farmer uncle what is going on?

Keywords: Free download of Chinese PPT courseware for the fifth grade in the textbook version, PPT download of food chain and food web, PPT download of biology and environment, .PPT format;

For more information about the "Biology and Environment Food Chain and Food Web" PPT courseware, please click the "Biology and Environment ppt Food Chain and Food Web ppt" tab.

"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..

"Change the Ecological Bottle" Biology and Environment PPT Download:

"Changing the Ecological Bottle" Biology and Environment PPT Download Part One: Collaborative Exploration 1. Reduce the Water in the Ecological Bottle Questions raised If there is less water, what will happen to the animals in the ecological bottle? It is speculated that the number of times the animals in the ecological bottle float to the water will change...

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Update Time: 2024-11-22

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