1. Ecosystem Balance
Test Review

2. Question 1 (6 Points)
List, in order, the 6 communities in primary succession from the pioneer community to the climax community
a. Pioneer Community: ______________
b. _______________________________
c. _______________________________
d. _______________________________
e. _______________________________
f. Climax Community: _______________
Lichen
Grasses
Shrubs
Heath Mat
Pine Trees
Hardwood Trees

3. Question 2 (4 Points)
Besides humans, what are 4 factors that can influence the stability of an ecosystem?
Answer:
Biotic, abiotic, patterns of energy, nutrient cycling, communities, and food webs

4. Question 3 (3 Points)
How does primary succession differ from secondary succession?
Answer:
Primary – organisms and soil is gone
Secondary – only organisms gone

5. Question 4 (2 Points) In what biome do we live?
Answer: Deciduous Forest

6. Question 5 (2 Points) Which biomes have the most biomass?
Answer: Forest

7. Question 6 (2 Points) Which biome covers the largest land area?
Answer: Desert

8. Question 7 (2 Points) What is a biome?
Answer: Largest category scientists use to classify ecosystems

9. Question 8 (2 Points)
Why are herbivores not considered to be parasites?
Answer: They don't live on or in the bodies of plants

10. Question 9 (2 Points)
Which symbiotic relationship helps one species and does not harm or help the other?
Answer: Commensalism

11. Question 10 (1 Points)
A relationship between species in which one species benefits and the other is harmed is called?
A. Parasitism
B. Commensalism
C. Mutualism
D. Symbiosis

12. Question 11 (1 Points)
Elephants and rhinos tolerate the small birds that ride their backs and eat insects o their skin. The relationship between the elephants and the birds is an example of?
A. Parasitism
B. Commensalism
C. Mutualism
D. Symbiosis

13. Question 12 (1 Points)
An increase in a predator population will directly result in
A. Decline in prey population
B. Decreased predation
C. Starvation
D. Ecosystem balance

14. Question 13 (1 Points) The size of the host population controls
A. the geographic range of parasites
B. important bodily functions
C. the size of the parasite population
D. the size of the prey population

15. Question 14 (1 Points)
You would be most likely to find populations of host organisms parasitized when
A. they have little to eat
B. they cannot escape
C. they are diseased
D. they are overcrowded

16. Question 15 (1 Points) Mutualism is often the result of A. coevolution
B. symbiosis
C. fierce competition
D. cooperation

17. Question 16 (1 Points) Parasitism is an example of A. coevolution
B. symbiosis
C. ecosystem balance
D. predation

18. Question 17 (1 Points)
A defining characteristic of a climax community is that it is essentially
A. sedimented
B. stable
C. forested
D. grassy

19. Question 18 (1 Points)
The first organisms to colonize a newly formed lifeless habitat are part of
A. a shoreline ecosystem
B. secondary succession
C. primary succession
D. mature communities

20. Question 19 (1 Points) Aquatic succession typically begins
A. on the surface of a lake
B. at the shoreline of a lake
C. at the bottom of a lake
D. in the middle of a lake

21. Question 20 (1 Points)
Which type of disturbance would most likely result in secondary succession
A. rainfall creates a new lake at the top of a
mountain
B. glacier retreats leaving barren rock
C. a volcanic eruption
D. an earthquake

22. Question 21 (1 Points) Why do new species often form on new islands?
A. New islands have a lot of vegetation
B. There is increased competition
C. Their populations explode
D. They evolve to fill new niches

23. Question 22 (1 Points)
When applied to ecology, what does the new field of mathematics called chaos theory imply?
A. Ecosystems are really not balanced
B. Organisms are constantly changing to
meet new conditions
C. One small change in an ecosystem can
lead to drastic results
D. Ecosystems are really not balanced

24. Question 23 (1 Points)
The kind of biome that will develop in an area is determined mainly by temperature and
A. pressure habitats
B. precipitation
C. average wind speed
D. organisms present

25. Question 24 (1 Points)
The biome with the greatest species diversity is the
A. rain forest
B. deciduous forest
C. wetlands
D. tundra

26. Question 25 (1 Points)
Which of the following biomes receives the least amount of rainfall?
A. tropical dry forest
B. tundra
C. chaparral
D. shrubland

27. Question 26 (1 Points)
In which biome does fire play an important part in maintaining ecosystems?
A. tropical dry forest
B. tundra
C. chaparral
D. shrubland

28. Good Luck!
And STUDY!!!