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Biology: The Unity and Diversity of Life

Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter 47

Ecosystems - all with Video Answers

Educators

RW

Chapter Questions

01:03

Problem 1

In most ecosystems, the primary producers use energy from ______ to build organic compounds.
a. sunlight
b. heat
c. breakdown of wastes and remains
d. breakdown of inorganic substances in the habitat

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Problem 2

Organisms at the lowest trophic level in a tallgrass prairie are all ______.
a. at the first step away from the original energy input
b. autotrophs
c. heterotrophs
d. both a and b
e. both a and $c$

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Problem 3

Decomposers are commonly ______.
a. fungi
b. plants
c. bacteria
d. a and c

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Problem 4

All organisms at the first trophic level ______.
a. capture energy from a nonliving source
b. obtain carbon from a nonliving source
c. would be at the bottom of an energy pyramid
d. all of the above

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00:49

Problem 5

Primary productivity on land is affected by ______.
a. nutrient availability
b. amount of sunlight
c. frozen as ice
d. in bodies of organisms

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10:28

Problem 8

Earth's largest carbon reservoir is ______.
a. the atmosphere
b. sediments and rocks
c. seawater
d. living organisms

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01:16

Problem 9

Carbon is released into the atmosphere by ______.
a. photosynthesis
b. aerobic respiration
c. burning fossil fuels
d. b and c

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02:44

Problem 10

Greenhouse gases ______.
a. slow the escape of heat energy from Earth into space
b. are produced by natural and human activities
c. are at higher levels than they were 100 years ago
d. all of the above

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00:59

Problem 11

The ______ cycle is a sedimentary cycle.
a. water
b. carbon
c. nitrogen
d. phosphorus

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Problem 12

Earth's largest phosphorus reservoir is ______.
a. the atmosphere
b. guano
c. sediments and rocks
d. living organisms

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01:19

Problem 13

Plant growth requires _____ uptake from the soil.
a. nitrogen
b. carbon
c. phosphorus
d. both a and c
e. all of the above

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01:11

Problem 14

Nitrogen fixation converts ______ to ______.
a. nitrogen gas; ammonia
b. nitrates; nitrites
c. ammonia; nitrogen gas
d. ammonia; nitrates
e. nitrogen gas; nitrogen oxides

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03:07

Problem 15

Match each term with its most suitable description.
_____producers
_____herbivores
_____decomposers
_____detritivores
_____trophic level
_____biological magnification
a. steps from energy source
b. feed on small bits of organic matter
c. degrade organic wastes and remains to inorganic forms
d. capture sunlight energy
e. feed on plants
f. toxins accumulate

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