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a. commensalisms
b. mutualism
c. predator prey relationship
d. competitive exclusion

1. An organism’s ______ is the role it has in its habitat
A. niche
B. survival
C. succession
D. mutualism
2. The changes in an abandoned field over time are known as _____
A. weathering
B. succession
C. climax
D. homeostasis
3. ____ use the sun’s energy to make complex organic compounds
A. Consumers
B. Producers
C. Decomposers
D. Predators
4._____ are organism’s that break down organic wastes.
A. Consumers
B. Producers
C. Decomposers
D. Predators
5. Large populations of producers are needed to support a small population of
A. scavengers
B. parasites
C. decomposers
D. consumers
6. Which one of the following is an example of a second-order consumer?
A. deer
B. rabbit
C. fox
D. grasshopper
7. Animals that are fed upon by predators are called
A. game
B. mimics
C. populations
D. prey
8. Consumers that feed on dead organisms are
A. parasites
B. scavengers
C. predators
D. pathogens
9. _______ is an association between different species of organisms that is beneficial to both
A. Parasitism
B. Consumerism
C. Mitosis
D. Mutualism
10. A walking stick insect can be mistaken for a twig. This adaptation is
A. competition
B. mimicry
C. strategy
D. limitation
11. Which of the following is a physical factor in an ecosystem?
A. Community
B. water
C. plant
D. bacteria
12. The nitrogen cycle is important because all organisms need nitrogen
A. in the air
B. for photosynthesis
C. to produce ammonia
D. to make proteins
13. Some kangaroos in Australia graze on low-growing plants. Reindeer in the far north also eat low-growing plants. This shows that both have similar
A. niches
B. biomes
C. succession
D. habitats
14. Continued succession in a community will result in
A. natural selection
B. a forest
C. a new ecosystem
D. a stable community

8.
The competitive exclusion principle states that competition usually results in the establishment of cooperation between two species.
A) True
B) False
9.
A long-term relationship in which both participating species benefit is known as parasitism.
A) True
B) False
10.
The process by which species evolve in response to other living members of their ecosystem is called
A) compromise.
B) parasitism.
C) coevolution.
D) ecology.
11.
An organism’s niche includes
A) what it eats.
B) where it eats.
C) when it eats.
D) All of the above
12.
The relationship between plants and the bees that pollinate them is an example of
A) commensalism.
B) competition.
C) mutualism.
D) parasitism.
13.
When two species compete, the niche that each species ultimately occupies is its
A) competitive niche.
B) realized niche.
C) fundamental niche.
D) exclusive niche.
14.
Mutualism is a symbiotic relationship in which only one party benefits.
A) True
B) False
15.
The number of trophic levels in an ecological pyramid
A) is limitless.
B) is limited by the amount of energy that is lost at each trophic level.
C) never exceeds four.
D) never exceeds three.

Science Packet Questions:
Which is a biotic factor that affects the size of a population in a specific ecosystem?
a. average temperature of the ecosystem b. type of soil in the ecosystem
c. number and kinds of predators in the ecosystem d. concentration of oxygen in the ecosystem
During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. This behavior is probably due to
a. its need to find different food to eat
b. the change in an abiotic factor in its environment
c. its need to find a new habitat
d. the change in a biotic factor in its environment
An organism’s niche is
a. the range of physical and biological conditions in which an organism lives and the way in which it uses those conditions
b. all the physical and biological factors in the organism’s environment
c. the range of temperature that the organism needs to survive
d. a full description of the place an organism lives
Several species of warblers can live in the same spruce tree ONLY because they
a. have different habitats within the tree
b. eat different foods within the tree
c. occupy different niches within the tree
d. can find different temperatures within the tree
An interaction in which one organism captures and feeds on another organism is called
a. competition b. sybiosis c. mutualism d. predation

1.Commensalism involves…
A.Abiotic factors B.Biotic factors
2.Competition
A.Abiotic factors B.Biotic factors
3.Habitat
A.Abiotic factors B.Biotic factors
4.Mutualism
A.Abiotic factors B.Biotic factors
5.Niche
A.Abiotic factors B.Biotic factors
6.Predation
A.Abiotic factors B.Biotic factors