Name _____________________________________________Date_____________Hour________
Populations/Communities/Ecosystems Final Exam Review
Directions: Select the best answer that completes each statement. Write the letter of your answer in
the space provided.
_____1. A group of organisms of the same species living together in the same place is called a
a. community b. biome c. population d. habitat
_____2. all of the following are biotic factors of a habitat except
a. soil b. plants c. insects d. molds
____3. A relationship between a producer and consumer is best shown by a
a. plant eating a fungus
b. fox eating a mouse
c. lion eating Ms. Long
d. zebra eating grass
_____4. In a food web, which type of organism receives energy from every other type of organism?
a. producer b. carnivore c. decomposer d. herbivore
_____5. The number of trophic levels in an ecological pyramid
a. is limited by the amount of energy that is lost at each trophic level
b. is unlimited due to the amount of energy provided by the sun
c. never exceeds three
d. equal to the number of customers that Wendy’s served
_____6. Going one trophic level to the next higher level,
a. the number of organisms increases
b. the amount of usable energy increases
c. the amount of usable energy decreases
d. diversity of organisms increases
_____7. What would happen to any food web if the plants were eliminated?
a. the herbivores would change trophic levels
b. herbivores would become carnivores
c. the food web would collapse
d. nothing would happen
_____8. What term applies to most humans?
a. detritivore b. producer c. herbivore d. omnivore
_____9. In a meadow food chain, which is the correct order of energy flow?
a. hawk – snake – mouse- grass
b. snake – mouse – hawk- grass
c. mouse – grass –hawk – snake
d. grass – mouse – snake –hawk

_____10. Bears, snakes, and worms can be members of the same
a. species b. trophic level c. ecosystem d. none of the above
_____11. Organisms that obtain their energy from the organic wastes and dead bodies at all the
energy levels in an ecosystem are called
a. decomposers b. detritivores c. consumers d. all of the above
Directions: Fill in the blank
12. The same type of organisms living in the same area that are able to reproduce with one another
are called a ______________________
13. The nonliving factors in a habitat are called _____________________factors.
14. Animals known as __________________________eat only primary consumers.
15. The term _______________________ is given to the bacteria that break down dead tissue.
Short Answer
16. Why are decomposers necessary for continuation of life on Earth? What would happen if they
disappeared?
17. Humans, raccoons, and bears are omnivores. What adaptive advantage might this feeding
strategy provide?
18. Why are producers a necessary part of every food web?
19. Why is it an advantage that parasites do not kill their hosts?
20. Give three examples of limiting factors (resources) that may affect the carrying capacity of an
ecosystem.
21. How is the carrying capacity of a habitat affected by an increase in the population of consumers
(herbivores)
22. What does a logistical graph look like? How is it different from an exponential graph? What do
they show about the carrying capacity of an particular environment?

Define the following words:
Term Definition Organism 1 Organism 2
Symbiosis
Parasitism
Mutualism
Commensalism
Competition
Density Dependent Factor