2. What is a saprop~y~? A pam~i~?
9. In the ecological pyramid shown, the lea~ amount of
energy is conr2ined in the tropbJc level labeled:
a. 1 b.2 c. 3 d. 4
10. Which ~oup of ors-~nisms is regporsible for releasing
nutrienu ~ack ~o ~e ~osystem so ~a~ ~e n~fi~ may
be r~cl~ by producers?
a. ~s~ b. b~efiz c. ma~a!~ d. ph?¢opl~on
DATE
CLASS _
PART B In the space below, draw a food chain with four trophic levels.
PART ~, Complete the following.
1. What is meant by trophic level?
~:. Name the four main trophic levels, and describe what takes place at each level.
Give an example of each of the followir~g: scavenger, herbivore, carnivore, omnivore, and
decomposer.
4. Suppose you observe the following interactions among organisms A, B, C, and D.
Organism A feeds on B. B makes food through photosynthesis. Organism C feeds on D,
and D feeds on A. Identify A, B, C, and D as either a producer, primary consumer,
secondm7 consumer, or tertiary consumer.
Explain the process by which DDT has affected the bald eagle population.
Unit 9 Review Module
Copyright © Addison Wesley Longman, Inc. All rights reserved.
Date
Class
Name
17. What does a consumer in a food chain depend on for energ~y?
Ecological Pyramids (pagee 72-73i
18. What is an ecological pyramid?
19. Why is it that only part of the energy stored in one trophic level is
passed on to the next level?
20. Complete the energy pyramid by writing the source of the energy
for the food web and how mud~ energy is available to first-,
second-, and third-level constuners.
Heat
Heat
Heat
Heat
Third-level consumers
Second-level consumers
Firstqevet consumers
00% Producers
21. What is biomass?
22. What does a biomass pyramid represent?
23. What does a pyramid of nnmbers show?
24. Why can each t~’opl~ic level support only about one tenth the
amount of livLng tissue as the level below
Guided Readh~g and Study Workbook/Chapte~ 3
25
Greenhouse Effect - the heat-trapping action of particular gases in our
atmosphere (energy comes in as solar radiation, converted into heat,
the heat cam~ot escape into space as easily).
Herbivore - a consumer that eats only plants.
Heterotroph - an organism that cannot make its own food.
Niche - the specific role, function, or position of an organism in an ecosystem.
Nitrogen Cycle - the pathway by which nitrogen moves through the
environment (includes nitrogen fixation, denitrifying, ammonification).
Nonrenewable Resource - a resource that cannot be replenished as
quickly as it is being consumed° Ex. fossil fuels.
Onmivore - a consumer that eats b~fl~ producers (ex. plants) and consumers
(ex. other animals).
Ozone Layer - a layer in the stratosphere that is composed of ozone (03),
~t helps shield the Earth from dangerous UV radiation.
Producer - an autotroph that provides food for a community~
Renewable Resource - a resource that can be replenished as quickly as it
is being consumed. Ex. air, trees
Scavenger - A consumer that feeds on the remains of dead organisms.
Trophiclevels - a step in the transfer of energy (and matter) in a
food chain.
Water Cycle - the pathway by which water cycles between the Earth’s
surface and its atmosphere. (includes precipitation, evaporation,
condensation, runoff, soil infiltration).
"Energy flows (one way), Matter cycles"
Approximately 10% of the energy is passed from one trophic level the next one