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Test Description: Chapter 20 Review
Instructions: Answer all questions to get your test result.
1) What role do bacteria play in soil ecosystems?
A
They add air to soil.
B
They break down rocks.
C
They tunnel through soil.
D
They return nutrients to soil.
2) What is the driving force behind the water cycle?
A
wind
B
gravity
C
plants
D
sunlight
3) Which organism is a producer?
A
cow
B
dog
C
grass
D
human
4) Which is a biotic factor?
A
the angle of the Sun
B
the types of minerals present in soil
C
a plant living near a stream
D
the amount of rainfall
5) Which includes both an abiotic factor and a biotic factor?
A
a rock rolling down a hill
B
a chicken laying an egg
C
a deer drinking from a stream
D
a squirrel eating an acorn
6) Which process helps keep temperatures on Earth from becoming too hot or too cold?
A
condensation
B
greenhouse effect
C
global warming
D
nitrogen fixation
7) During the carbon cycle, ________take in carbon dioxide from the atmosphere.
A
animals
B
decomposers
C
plants
D
consumers
8) Which best represents a food chain?
A
Sun -- grass -- rabbit --fox
B
Sun -- rabbit -- fox -- grass
C
grass -- rabbit -- fox -- Sun
D
fox -- grass -- rabbit -- Sun
9) A person who ate a salad made of lettuce, tomatoes, cheese, and ham is a(n)
A
detritivore
B
carnivore
C
herbivore
D
omnivore
10) In which process do producers use chemical energy and make food?
A
glycolysis
B
chemosynthesis
C
fermentation
D
photosynthesis
11) What organisms help break down dead leaves in an ecosystem?
A
herbivores
B
omnivores
C
detritivores
D
carnivores
12) Which process converts atmospheric nitrogen to a from organisms can use?
A
fixation
B
retention
C
stabilization
D
absorption
13) Which is true of energy in ecosystems?
A
It follows a cycle pattern
B
It flows in one direction
C
It is both created and destroyed
D
It never changes form
14) Which organism would most likely appear at the top of an energy pyramid?
A
grass
B
snake
C
mouse
D
hawk
15) During which process is oxygen gas released into the atmosphere?
A
photosynthesis
B
chemosynthesis
C
decomposition
D
transpiration
16) Which is true of the amount of matter in ecosystems?
A
Scientists cannot determine how it changes
B
It decreases over time
C
It increases over time
D
It remains constant
*select an answer for all questions
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