Lesson3: Changing Ecosystem
Presentation
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Science
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7th Grade
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Practice Problem
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Medium
yamna Alketbi
Used 26+ times
FREE Resource
23 Slides • 11 Questions
1
Changing Ecosystem
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Poll
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?
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Ecological Succession
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Multiple Choice
What is ecological succession?
A slow change in an environment
No change
A change that takes days in an environment
Abiotic change
10
Multiple Choice
A climax community is …
the beginning of a new ecological succession.
the rocks in a new environment.
the fire that will cause destruction.
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.
True
False
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Primary Succession and pioneer species
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Primary Succession
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Multiple Choice
What are examples of pioneer species in a primary succession?
Bushes and Shrubs
Mosses and Lichens
Oak trees
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.
True
False
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Multiple Choice
If an existing ecosystem is destroyed, ________.
A)
primary succession occurs
B)
secondary succession occurs
C)
a climax community comes into existence
D)
a different type of biome emerges
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Multiple Choice
During a forest fire most vegetation (plants) burn. Which ecological succession will take place after a forest fire?
Primary
Secondary
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Multiple Choice
After a volcanic eruption the lava cools and becomes rock. Which succession must take place in order for vegetation (plants) to occur?
Primary Succession
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
pollution: when contaminants are brought into an environment and case negative change.
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?
A)
The algae use so much of the oxygen in the water that fish die, decay and add to the build up of soil.
B)
The algae become soil.
C)
The growth of the algae causes pollution to increase.
D)
The presence of the algae encourages sediment to drop out of streams into the pond.
Changing Ecosystem
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