"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 6

Description

"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 6

teaching objectives

1. Outline the components of an ecosystem.

2. Describe food chains and food webs in ecosystems.

3. Explain that certain harmful substances accumulate through the food chain.

4. Clarify that ecosystems have limited ability to self-regulate.

Teaching focus

1. The composition of the ecosystem.

2. Food chain and food web.

3. The automatic adjustment ability of the ecosystem.

Teaching difficulties

1. Food chain and food web.

2. The automatic adjustment ability of the ecosystem.

ANALYSE information

1. What is the relationship between trees, insect larvae, and woodpeckers?

Insect larvae eat organic matter in tree trunks, and woodpeckers eat insect larvae.

2. Will rotten tree stumps eventually disappear?

meeting. The organic matter in the trunk will be decomposed into inorganic matter (water, carbon dioxide, inorganic salts) by fungi, bacteria, etc.

3. What roles do plants, animals and fungi play in ecosystems?

Plants play the role of producers, animals play the role of consumers, and fungi play the role of decomposers.

food chain and food web

1. Food chain

In an ecosystem, the chain structure formed between different organisms due to the relationship between eating and being eaten is called

2. Food web

In an ecosystem, there are often many food chains, which are intertwined and connected to form a food web.

How to write food chain:

(1) Arrow points to predator

(2) Start with the producer,

(3) Ending with the highest-level consumers

ecological balance

1. Definition: The environment and the number and proportion of various animals in the ecosystem can remain relatively stable for a long time.

2.Characteristics

(1) The organisms in the ecosystem do not exist in isolation, but are interconnected.

(2) The ecosystem has a certain adjustment ability, but this adjustment ability has certain limits.

Summary of this lesson

1. The concept of ecosystem

2. Composition of ecosystem

3. The ecosystem has the ability to automatically adjust

4. Ecological balance

after class homework

1. Decide whether the following statements are correct. Mark “√” for correct answers and “×” for wrong answers.

(1) Crops in a piece of farmland can be regarded as an ecosystem. ( )

(2) Producers, consumers and decomposers constitute a complete ecosystem. ( )

(3) The automatic adjustment ability of the ecosystem is limited. If external interference exceeds a certain range, the ecosystem may be damaged. ( )

2. Among the following four options, which one correctly represents the food chain ( )

A. Sunshine → Grass → Ox → Tiger B. Rat → Snake → Eagle

C. Eagle → Snake → Frog → Insect D. Grass → Rabbit → Eagle

3. Some people like to eat frogs, so some people capture wild frogs in large numbers. What are the consequences of this practice?

Wild frogs feed on insects, while most insects such as locusts and grasshoppers feed on plants, causing certain harm to crops. Therefore, predating frogs will cause harmful insects to lose their natural enemies and reproduce in large numbers, resulting in reduced food production.

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Update Time: 2024-11-22

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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