Science Question Preview (ID: 33181)


Chapter 20 Review. TEACHERS: click here for quick copy question ID numbers.

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 process converts atmospheric nitrogen to a from organisms can use?
a) absorption
b) fixation
c) retention
d) stabilization

What organisms help break down dead leaves in an ecosystem?
a) carnivores
b) detritivores
c) herbivores
d) omnivores

In which process do producers use chemical energy and make food?
a) chemosynthesis
b) fermentation
c) glycolysis
d) photosynthesis

A person who ate a salad made of lettuce, tomatoes, cheese, and ham is a(n)
a) carnivore
b) detritivore
c) herbivore
d) omnivore

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

During the carbon cycle, ________take in carbon dioxide from the atmosphere.
a) animals
b) consumers
c) decomposers
d) plants

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

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 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 organism is a producer?
a) cow
b) dog
c) grass
d) human

What is the driving force behind the water cycle?
a) gravity
b) plants
c) sunlight
d) wind

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.

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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