Lesson3: Changing Ecosystem

​Changing Ecosystem

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

​page 105

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Draw

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

​Ecological Succession

Multiple Choice

What is ecological succession?

• A slow change in an environment

• No change

• A change that takes days in an environment

• Abiotic change

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.

Multiple Choice

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

• True

• False

​Primary Succession and pioneer species

​Primary Succession

Multiple Choice

What are examples of pioneer species in a primary succession?

• Bushes and Shrubs

• Mosses and Lichens

• Oak trees

• A rose Bush

​Secondary Succession

Multiple Choice

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

• True

• False

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

Multiple Choice

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

• Primary

• Secondary

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

​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.