2. 7 th Grade Science Organisms Adaptations and their Ecosystems

3. A:B: biosphereecosystem #1 A unit consisting of all the living and nonliving things in a given area that interact with one another. C:D: communitypopulation

4. B. ecosystem

5. A:B: Primary successionSecondary succession C:D: BothNeither #2 *Volcanic eruptions breaking the surface of the ocean. *Lichens move in on an area of bare rock. These are examples of ________ _________.

6. A. Primary succession

7. A:B: Primary successionSecondary succession C:D: BothNeither #3 *Farmer plows a field and leaves it unattended. *Hurricane destroys a Coastline. *Forest re-grows after a forest fire. These are examples of ________ _________.

8. B. Secondary succession

9. #4#4 Lichens grow on bare rock. Lichens break down the rock with a mild acid. A thin layer of soil is formed. Grasses begin to grow on the soil. Decaying organic matter forms a thicker layer of soil. Small shrubs begin to grow. Trees with deeper roots grow in the deeper layer of soil. A forest is formed. This process is an example of _______ ________. A.Primary succession B.Secondary succession

10. A. Primary succession

11. A:B: Primary begins on bare rock. Secondary begins when soil is already present. Secondary begins on bare rock. Primary begins when soil is already present. C:D: BothNeither #5 What is the major difference between primary and secondary succession?

12. A. Primary begins on bare rock. Secondary begins when soil is already present.

13. A:B: It increases the number of types of species It prevents other species from arriving. C:D: It slows the rate of plant growth B and C #6 *Ecological succession helps to maintain equilibrium in an ecosystem. How would secondary succession help to restore equilibrium after a flood?

14. A. It increases the number of types of species

15. A:B: the nonnative animal has several natural enemies the nonnative animal has no natural enemies C:D: the nonnative animal can learn to behave like the native animals Neither #7 *A nonnative animal is introduced into a mature ecosystem. *The animal will increase in the new community if ____.

16. B. They must adapt to their environment

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