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Lesson3: Changing Ecosystem

Lesson3: Changing Ecosystem

Assessment

Presentation

Science

7th Grade

Practice Problem

Medium

Created by

yamna Alketbi

Used 26+ times

FREE Resource

23 Slides • 11 Questions

1

​Changing Ecosystem

2

Poll

Question image

the animals that eat plants would all die. The animals that eat only animals would live.

some of the plants-eating animals would die. others would live by switching to eat other animals

all of the animals would eventually run out of food and die

all of the animals would survive by eating other foods

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​page 105

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Draw

what did you think will happens to the plants after years?

8

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​Ecological Succession

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9

Multiple Choice

What is ecological succession?

1

A slow change in an environment

2

No change

3

A change that takes days in an environment

4

Abiotic change

10

Multiple Choice

A climax community is …

1

the beginning of a new ecological succession.

2

the rocks in a new environment.

3

the fire that will cause destruction.

4

an area that reaches its greatest growing potential.

11

Multiple Choice

Ecological succession can begin when seeds are carried to bare areas by birds or the wind.

1

True

2

False

12

​Primary Succession and pioneer species

13

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​Primary Succession

14

Multiple Choice

What are examples of pioneer species in a primary succession?

1

Bushes and Shrubs

2

Mosses and Lichens

3

Oak trees

4

A rose Bush

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​Secondary Succession

17

Multiple Choice

Ecological succession in new areas of land with little or no soil is secondary succession.

1

True

2

False

18

Multiple Choice

If an existing ecosystem is destroyed, ________.

1

A)

primary succession occurs

2

B)

secondary succession occurs

3

C)

a climax community comes into existence

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D)

a different type of biome emerges

19

Multiple Choice

During a forest fire most vegetation (plants) burn. Which ecological succession will take place after a forest fire?

1

Primary

2

Secondary

20

Multiple Choice

After a volcanic eruption the lava cools and becomes rock. Which succession must take place in order for vegetation (plants) to occur?

1

Primary Succession

2

Secondary Succession

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​page 111

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​How do changing ecosystems affect populations?

​Dynamic Equilibrium

​Describes the balance between different parts of the ecosystem

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Resource Extraction: any activity that take resource from nature

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pollution: when contaminants are brought into an environment and case negative change.

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Nonnative Species: a species lives outside of its natural range.

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Multiple Choice

As eutrophication occurs, populations of algae grow. How does this speed up succession?

1

A)

The algae use so much of the oxygen in the water that fish die, decay and add to the build up of soil.

2

B)

The algae become soil.

3

C)

The growth of the algae causes pollution to increase.

4

D)

The presence of the algae encourages sediment to drop out of streams into the pond.

​Changing Ecosystem

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