"Food Chains and Food Webs" Biology and Environment PPT Courseware 2

Description

"Food Chains and Food Webs" Biology and Environment PPT Courseware 2

learning target:

Knowledge goal:

1. Describe the trophic structure of ecosystems—food chains and food webs.

2. Clarify the correct way to write food chain.

3. Analyze graphic materials and explain the phenomenon of biological enrichment.

Ability goal: Cultivate a spirit of cooperation through hands-on operations,

Improve hands-on ability.

Emotional goals: Enhance environmental awareness and develop good living habits.

1. Food chain

1. Concept:

A relationship formed by various organisms due to food relationships.

Compliance test one

1. Each group uses the pictures provided to find a food chain and demonstrate it, pointing out the components.

(Tip: There are 6 pictures in total, not all of them may be used)

2. After Xiaoli learned about food chains, she wrote several food chains. Do you think what she wrote is correct? If it is not correct, explain why.

Use your brain:

1. Why does the higher the consumer level, the greater the concentration of DDT in the body?

Once DDT is absorbed by organisms, it is difficult to decompose and accumulates in organisms through the food chain. The concentration of DDT will gradually increase as the level of consumers increases.

2. If these fish that have accumulated toxic substances are eaten by people, what will be the consequences?

DDT will continue to accumulate in the human body, causing poisoning and, in severe cases, death.

2. Bioconcentration:

Some harmful substances such as lead, mercury, copper and other heavy metals and certain pesticides continue to accumulate in organisms through the food chain, and their concentrations gradually increase with the increase in consumer levels.

Compliance test two

1. Which of the following food chain representations is correct ()

A. Sunshine → Grass → Rabbit → Fox B. Vole → Snake → Eagle

C. Grass → Sheep → Deer → Wolf D. Wheat → Vole → Snake → Eagle

2. Which of the following belongs to the relationship between consumers and producers ( )

A. The kitten eats the fish B. The weasel eats the chicken

C. Giraffes eat leaves D. Squirrels eat mushrooms

3. Minamata disease is caused by mercury poisoning. In the food chain of "aquatic plants → shrimp → fish → osprey", the highest mercury content in the body is ( )

A. Aquatic plants B. Shrimp C. Fish D. Osprey

4. Four students expressed their opinions on the food chain "green plants → herbivorous insects → insect-eating birds". Which one do you think is incorrect ( )

A. Green plants belong to producers

B. Herbivorous insects and insectivorous birds are both consumers

C. Protecting birds is beneficial to humans

D. The food chain itself is an ecosystem

5. If wolves were eliminated in a relatively closed ecosystem consisting of grasslands, deer and wolves, the number of deer would be ( )

A rises rapidly B rises and then falls

C remains relatively stable D rises slowly

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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.

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Update Time: 2024-11-26

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

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