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