"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 2

"Ecosystems Composed by Biology and Environment" Understanding the Biosphere PPT Courseware 2

learning target:

1. The concept of ecosystem

2. Composition of ecosystem

3. Food chain and food web

4. The ecosystem has certain automatic adjustment capabilities

Question 1. The composition of the ecosystem

1. (1) What is the relationship between trees, insects, larvae and woodpeckers?

(2) Will rotten tree stumps eventually disappear?

(3) What roles do plants, animals, and fungi play in the ecosystem?

Question feedback 1. The composition of the ecosystem

1. Which of the following belongs to the ecosystem ( )

A. Water plants in the pond B. Fish in the pond

C. All the creatures in the pond D. A pond

2. The biosphere nurtures all living things. Human beings and various living creatures live together in this big family, and they each play different roles. The person below who plays the role of decomposer is ( )

① Chlamydomonas in fresh water ② Pinus tabulaeformis in the mountains

③Bacteria in the soil ④Mushrooms on rotten wood

⑤ Hemp on the tree ⑥ Frog by the river

⑦Earthworms in the soil ⑧Caterpillars on the leaves

⑨Worm in the pond ⑩Bright dahlias

A.①②③④B.⑤⑥⑦⑧

C.③⑥⑨　D.③④⑦

Question 2: Food chain and food web

1. In an ecosystem, the chain structure formed by the _______ relationship between different organisms is called a food chain.

2. Discuss through P22 “Observation and Thinking”:

(1) How many food chains are you connected to? Are they unrelated to each other?

(2) If the number of snakes decreases significantly, the numbers of which organisms may change? What changes have occurred?

3. Analyze the information on page 23 of the textbook, discuss and think

(1) If these fish that have accumulated a lot of toxic substances are eaten by people, what will be the consequences?

(2) Why do organisms with higher trophic levels in the food chain accumulate more toxic substances in their bodies?

Question 3: Self-regulation of ecosystems

1. Scenario: On the grassland, there is abundant rainfall. The climate is suitable and the vegetation is luxuriant.

(1) Because there is sufficient food, the number of rabbits increases rapidly. Will it increase indefinitely?

(2) If the pasture is overgrazed, will the pasture remain in its original state?

2. What kind of ecosystem is easily destroyed? What kind of ecosystem is not easily destroyed? Why?

Compliance testing

1. Which of the following can be called an ecosystem ( )

A. All the fish in the Yi River B. All the vegetation on the Mengshan Mountain

C. All teachers and students on campus D. Yinan Xishan Zhuge Liang Park

2. Which of the following belongs to the producer ( )

A.Farmer B.Weed C.Pest D.Mushroom

3. In daily life, the role of the various mushrooms we eat in the ecosystem is ( )

A.Producer B.Consumer C.Decomposer D.Abiotic

4. In order to protect the environment, scientific workers who conduct expeditions to Antarctica must not only take plastic and metal waste away from Antarctica, but also human urine, feces and other wastes. This is because ( )

A. Lack of necessary living facilities B. Lack of producers

C. Lack of consumers D. Lack of decomposers

5. Which of the following food chains is correct ( )

A. Eagle → Snake → Bird → Grass B. Grass → Grasshopper → Insect-eating bird → Snake → Eagle

C. Sunshine → Grass → Herbivorous seed bird → Eagle D. Mushroom → Hare → Fox ’

6. In an ecosystem, what determines the number of various organisms is ( )

A.Producer B.Consumer C.Decomposer D.Herbivore

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