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1-20-11 LE Final Practice
Test Description: Some of the APRCHS Living Environment 1-20-11 Final Exam questions without diagrams.
Instructions: Answer all questions to get your test result.
1) Organisms undergo constant chemical changes as they maintain an internal balance known as
A
homeostasis
B
interdependence
C
synthesis
D
recombination
2) WWhich sentence represents a hypothesis?
A
Is water depth in a lake related to available light in the water?
B
A lamp, two beakers, and elodea plants are selected for the investigation.
C
Boil 100 milliliters of water, let it cool, and then add 10 seeds to the water.
D
Environmental conditions affect germination.
3) Which system in humans is most directly involved in the transport of oxygen?
A
nervous
B
digestive
C
circulatory
D
excretory
4) Which statement about the use of independent variables in controlled experiments is correct?
A
A different independent variable must be used each time an experiment is repeated.
B
The independent variables must involve time.
C
Only one independent variable is used for each experiment.
D
The independent variables state the problem being tested.
5) Diagrams, table, and graphs are used by scientists mainly to
A
predict the independent variable
B
organize data
C
test a hypothesis
D
design a research plan for an experiment
6) The first life-forms to appear on Earth were most likely
A
simple multicellular organisms
B
complex single-celled organisms
C
complex multicellular organisms
D
simple single-celled organisms
7) Abiotic factors that could affect the stability of an ecosystem could include
A
hurricanes, packs of wolves, and temperature
B
droughts, floods, and heat waves
C
blizzards, heat waves, and swarms of grasshoppers
D
species of fish, number of decomposers, and supply of algae
8) In an ecosystem, what happens to the atoms of certain chemical elements such as carbon, oxygen, and nitrogen?
A
They are never found in living systems.
B
They move into living systems and remain there.
C
They move out of living systems and never return.
D
They move into and out of living systems.
9) Two closely-related species of birds live in the same tree. Species A feeds on ants and termites, while species B feeds on caterpillars. The two species coexist successfully becaus
A
birds compete for food
B
they use different methods of reproduction
C
they interbreed
D
each occupies a different niche
10) Ecosystems will have a greater chance of maintaining equilibrium over a long period of time if they have
A
predators eliminated from the food chains
B
a diversity of organisms
C
organisms imported by humans from other environments
D
a sudden change in climate
*select an answer for all questions
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