Camas B Invitational
Ecology
12/11/2010
School/Team: ________________________________________
ID: B - ____
Names: _____________________________________________
Instructions:
 Answer all questions on this answer sheet.
 Sheets may be double sided, check both sides!
 If you separate the sheets of the test be sure to label each sheet with
school/team and ID in case they get mixed up during scoring.
 Tie breakers: 1st total page 5, 2nd total page 4, 3rd total page 1
For Scoring only
Page 2
__________/23
Page 3
__________/16
Page 4
__________/26
Page 5
__________/22
Total
__________/87
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Camas B Invitational
Ecology
12/11/2010
True/False (1 point each)
Indicate whether the sentence or statement is true or false.
____
1. Dragons are apex predators.
____
2. A pegasus and a unicorn could have developed through divergent evolution.
____
3. If the number of births equals the number of deaths, you have reached the carrying capacity
____
4. Biotic potential is affected by how often each individual reproduces
____
5. A bell curve shows more prominent traits than average traits.
____
6. A species with low biotic potential will ALWAYS have a low population size
____
7. Wild fluctuations in population size is called chaos
____
8. A parasite usually kills its host.
____
9. Human intervention in natural community interactions usually makes the community more stable
____ 10. One of the effects of predation is the stabilization of the predator-prey relationship when there is not to much
predator pressure on the prey population
____ 11. In the study of a tidal pool, if the starfish, a keystone species, is removed, the other creatures flourish
Multiple Choice (2 points each)
Identify the letter of the choice that best completes the statement or answers the question.
____ 12. Since Dragons have long lifetimes and few young, they are
a. R strategests
c. In the middle
b. K strategests
____ 13. An example of a population dependant tragedy, is a(n)
a. Tidal wave
c. Meteor
b. Onset of an ice-age
d. Predation
____ 14. The sequence of decreased death rate followed by a decrease in birthrate is called
a. environmental resistance
d. demographic transition
b. a limiting factor
e. replacement reproduction
c. doubling time coefficient
____ 15. All of the conditions under which an organism could conceivably survive and reproduce constitute its
a. habitat
c. fundamental niche
b. realized niche
d. resource partition
____ 16. Which of the following are not subject to inter-species competition
a. food
d. sunlight
b. water
e. space
c. mates
____ 17. A harmless fly resembling a sting wasp is an example of
a. batesian mimicry
c. mutual camouflage
b. mullerian mimicry
d. Commensalism
2
Camas B Invitational
Ecology
12/11/2010
____ 18. A keystone species is
a. an organism that acts commensally in a
d. a prey species that must be present or the
host
predator species will die off
b. a predator that destroys may different
e. a species whose removal causes major
species in a community
shifts in other species in a community
c. a mimic that has the same appearance as a
another, poisonous species
____ 19. Decomposition is
a. the process by which energy moves
through a food web
b. the process by which water enters an
ecosystem
c. the process by which nutrients are
recycled
d. the process by which plants convert
sunlight to energy.
____ 20. The percentage of energy available from one trophic level to the next is
a. 1%
c. 50%
b. 10%
d. 90%
____ 21. A lake in the winter experiencing a loss of plankton and algae could explain
a. inverted pyramid of numbers
c. inverted pyramid of energy
b. inverted pyramid of biomass
____ 22. Which is not a density dependant limiting factor?
a. temperature
c. parasitism
b. competition
d. Predation
____ 23. Which layer is defined by the upper and lower limits where life is possible?
a. atmosphere
d. hydrosphere
b. biosphere
e. the earth's core
c. lithosphere
____ 24. Most natural food chains are only four or five links long. the number of trophic levels is limited because
a. there are more predators than herbivores c. the efficiency in utilizing the food eaten at
each level is very low
b. winter kills off most insects and stops the d. all of the above are correct
food chains
____ 25. Ocean currents
a. are generated by friction between winds
c. are important in shipping but have little
and oceans surfaces
effect on living environments
b. always move clockwise in an ocean basin d. are driven by the earth’s core rotating
faster than the ocean water
3
Camas B Invitational
Ecology
12/11/2010
Matching (2 points each)
Match these possible answers with the questions, not all must be used. they can be used more than once.
a.
b.
c.
d.
____
____
____
____
____
____
26.
27.
28.
29.
30.
31.
Phosphorous
Nitrogen
Carbon
Sulfur
32.
33.
34.
35.
36.
37.
38.
Water
Oxygen
Hydrogen
Arsenic
Photosynthesis is part of which cycle?
Assimilation is part of which cycle?
Transpiration is part of which cycle?
Metabolism is a key part of which cycle?
Which extra element is present in acid rain?
Ammoniafication is part of which cycle?
a. Tundra
b. Taiga
____
____
____
____
____
____
____
e.
f.
g.
h.
c. Both
d. Neither
Which has an average temperature below 0 degrees in winter
Which is Farther North?
Where are trees are present
Layer of Permafrost
Noted for higher rainfall
Which has a longer growing season?
In which do most animals hibernate of migrate?
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Camas B Invitational
Ecology
Short Answer
39. (6 points) Describe population density, population distribution, and carrying capacity
40. (4 points) Describe the process of borrowing carrying capacity
41. (6 points) Which is better commensalism of mutualism? describe them both
42. (6 points) What is amensalism and give an example.
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12/11/2010