1. Populations and Ecosystem
Chapter 2 Review

2. DIRECTIONS Each slide is numbered.
Number your paper as you complete each slide
Some questions are multiple choice and some are extended response
The answer key is on the last page
Grade your review sheet
Have your parent/guardian sign your notebook paper

3. 1. What kind of consumers are most humans?
A. Herbivores
B. Omnivores
C. Predator
D. Carnivores

4. 2. If a prey population decreases, the predator population will usually ­­­______________. Why?

5. 3. In the nitrogen cycle, what is converted to a usable form?
A. Nitrogen gas
B. Carbon dioxide
C. Nitrogen compounds
D. Oxygen

6. 4. In the nitrogen cycle, which organisms get the nitrogen straight from the atmosphere?
A. Humans and Horses
B. Bacteria growing on the roots of plants
C. Worms and snails
D. Dead plants and animals

7. 5. The flow of energy from one organism to another is called..
A. The nitrogen cycle
B. food web
C. A parasite-host relationship
D. A food chain

8. 6. What compounds act as the building blocks of living things?
A. Proteins
B. Sugars
C. Carbon dioxide
D. Food

9. 7. What process breaks down carbon compounds in the carbon dioxide-oxygen cycle?
A. Cell Respiration
B. Nitrogen fixing
C. Photosynthesis
D. Condensation

10. 8. Overlapping food chains form
A. First order consumers
B. Omnivores
C. Ecosystems
D. Food Webs

11. 9. What is the process by which water vapor is changed to liquid water?
A. Condensation
B. Evaporation
C. Precipitation
D. Transpiration

12. 10. When the predator population decreases, the prey population will usually ______________. Why?

13. 11. The process by which liquid water changes to water vapor is …
A. Condensation
B. Evaporation
C. Precipitation
D. Transpiration

14. 12. Place the letter of each member of the food chain into the correct spot of the energy pyramid.
A. Cricket
B. Grass
C. Hawk
D. Small bird
13. What organism has the MOST amount of energy in this pyramid?
14. What organism has the LEAST amount of energy in this pyramid?

15. ANSWER KEY
1. B
2. decrease, because there aren’t enough prey to eats so the predators could starve to death
3. A
4. B
5.D
6.A
7.A D A
increase, because there
aren’t enough predators
to eat the prey, so the
prey will live longer and
reproduce more
11. B
12.
13. grass
14. hawk C D A B