LT 4 and LT 5 Review
Place the following limiting factors into the correct column.
Density Independent.
1. Natural disaster
3. Parasitism
5. Behaviors
7. Temperature
9. Sunlight
11. Stress
Density Dependent
2. Competition
4. Disease
6. Physical characteristics
8. Predation
10. Crowding
12. Human activities
Determine if each statement is density independent (DI) or density dependent (DD). Then give a
reason for your choice.
____13. Pollution is affecting the water quality in the lake.
____14. The many fish in the tank scramble to get their share of the fish food.
____15. The disease almost killed the entire deer herd because it spread so fast.
____16. The water was so cloudy it limited the amount of sunlight aquatic plants received.
____17. Parasitic lampreys attached themselves to the fish swimming in the school.
LT – 5 Population Growth – Use the graphs to answer the questions that follow.
18. What type of growth is displayed on the graph? What is evidence for your choice?
19. Time intervals A and B together can be characterized as which type of growth? What is evidence for
your choice?
20. Circle all of the following that are true about the population at section D?
A. It is declining.
B. It is increasing.
C. It is stable
D. It is in equilibrium
E. Carrying capacity has been reached.
21. At which time interval on the graph do you start seeing the effect of limiting factors (food, water,
space) on the population? What is your evidence?
22. What type of limiting factors influence this type of growth?
23. Which type of growth is illustrated in the graph? What is your evidence?
24. Which segment of the graph represents the time period in which there are very few members in the
population and therefore very few reproducing pairs? What is this phase called?
25. Describe what is occurring at point B?
26. What is the only thing that influences exponential growth?
27. Describe two possibilities that could cause the situation at point F on the graph.