Science Question Preview (ID: 33181)
Chapter 20 Review.
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What role do bacteria play in soil ecosystems?
a) They add air to soil.
b) They break down rocks.
c) They return nutrients to soil.
d) They tunnel through soil.
What is the driving force behind the water cycle?
a) gravity
b) plants
c) sunlight
d) wind
Which organism is a producer?
a) cow
b) dog
c) grass
d) human
Which is a biotic factor?
a) a plant living near a stream
b) the amount of rainfall
c) the angle of the Sun
d) the types of minerals present in soil
Which includes both an abiotic factor and a biotic factor?
a) a chicken laying an egg
b) a deer drinking from a stream
c) a rock rolling down a hill
d) a squirrel eating an acorn
Which process helps keep temperatures on Earth from becoming too hot or too cold?
a) condensation
b) global warming
c) greenhouse effect
d) nitrogen fixation
During the carbon cycle, ________take in carbon dioxide from the atmosphere.
a) animals
b) consumers
c) decomposers
d) plants
Which best represents a food chain?
a) Sun -- rabbit -- fox -- grass
b) Sun -- grass -- rabbit --fox
c) fox -- grass -- rabbit -- Sun
d) grass -- rabbit -- fox -- Sun
A person who ate a salad made of lettuce, tomatoes, cheese, and ham is a(n)
a) carnivore
b) detritivore
c) herbivore
d) omnivore
In which process do producers use chemical energy and make food?
a) chemosynthesis
b) fermentation
c) glycolysis
d) photosynthesis
What organisms help break down dead leaves in an ecosystem?
a) carnivores
b) detritivores
c) herbivores
d) omnivores
Which process converts atmospheric nitrogen to a from organisms can use?
a) absorption
b) fixation
c) retention
d) stabilization
Which is true of energy in ecosystems?
a) It never changes form
b) It is both created and destroyed
c) It flows in one direction
d) It follows a cycle pattern
Which organism would most likely appear at the top of an energy pyramid?
a) grass
b) hawk
c) mouse
d) snake
During which process is oxygen gas released into the atmosphere?
a) chemosynthesis
b) decomposition
c) photosynthesis
d) transpiration
Which is true of the amount of matter in ecosystems?
a) It decreases over time
b) It increases over time
c) It remains constant
d) Scientists cannot determine how it changes
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