Chapter 4 Interactions of Life Review
Matching
a.
b.
c.
d.
e.
f.
g.
h.
population density
community
population
habitat
food chain
biosphere
limiting factor
niche
i. producers
j. ecology
k. carrying capacity
l. symbiosis
m. consumers
n. mutualism
o. parasitism
p. commensalism
q.
r.
s.
t.
u.
ecosystem
autotroph
competition
heterotroph
food web
____1. All of the populations in an ecosystem.
____2. The size of a population that occupies a specific area.
____3. The part of Earth that supports life.
____4. The feeding relationships among the organisms in an ecosystem.
____5. Anything that restricts the number of individuals in a population.
____6. Organisms that cannot make their own energy-rich particles.
____7. The largest number of individuals of one species that an environment can
support and maintain.
____8. A symbiotic relationship in which both species benefit.
____9. A symbiotic relationship in which one organism benefits but the other is
harmed.
___10. Organisms that use an outside energy source to make energy-rich
molecules.
___11. How an organism survives in its environment.
___12. A symbiotic relationship in which one partner benefits but the other in not
affected.
___13. All of the organisms in an area and the nonliving features of their
environment.
___14. The study of interactions among organisms and their environment.
___15. A close relationship between species.
___16. Organisms in an ecosystem that belong to one species.
___17. The place in which an organism lives.
___18. An organism that consumes other organisms for energy.
___19. Several interconnected food chains.
___20. When two or more organisms need the same resource at the same time.
___21. An organism that can produce its own food.
22. How do ecologists organize life on earth. Write the following terms in order
from largest to smallest: ecosystem, biosphere, organism, population, community.
1
23. What is population density?
24. According to the diagram, which of the organisms compete for the same food
source? Animals that compete for the plant are:
Animals that compete for the mouse are:
Animals that compete for the snake are:
25. According to the diagram, what organism would be represented by the “?” (A
carnivore, a decomposer, an herbivore, or an omnivore)?
8
7
6
5
4
3
2
1
0
Lynx (thousands)
160
140
120
100
80
60
40
20
0
Hares (thousands)
Lynx (thousands)
18
50
18
55
18
60
18
65
18
70
18
75
18
80
18
85
Hares (thousands)
Hare and Lynx Data
Years
26. According to the graph, when the hare population increases the lynx population
___________________.
27. According to the graph, the hare population peaks 4 times on the graph. About
how many years pass between peaks?
28. According to the graph, why do you think the lynx population decreases in
1862?
29. Draw a diagram showing the energy flow through an ecosystem. Include the
following: decomposer, sunlight, primary consumer, producer, and secondary
consumer.
30. What are 2 methods for estimating populations?
2
31. Use the random sampling technique to calculate a population of daffodils using
the grid below.
20
22
17
21
32. Twenty five deer were captured and tagged. Later, 100 deer were captured in
which 15 of these had tags. Calculate the entire population.
number captured x number tagged
number recaptured with tag
33. There are 3 basic interactions between populations in an ecosystem. What are
they?
34. There are 3 types of symbiotic relationships. List, define and give an example
of each type, and use the symbols that go with each type.
35. Circle the factors that make up an organism’s niche. A. How it finds a mate, B. How it
avoids danger, C. How it obtains shelter, D. How it digests its food E. How it cares for its young
36. What are 3 limiting factors?
37. For what do organisms compete in an ecosystem? (List 4)
38. Name and describe the type of growth that is displayed on the graph below.
3
39. Name and describe the population growth in the graph below.
40. Write the letter of the pyramid that applies to each of the following words.
Autotrophs=
Heterotrophs=
Producers=
Consumers=
Primary consumer=
Carnivore=
Herbivore=
A
B
C
D
E
4