Question 1

Which is not an important biogeochemical cycle on Earth?

Accepted Answer

A)   ATP cycle
B)   water cycle
C)   carbon cycle
D)   phosphorus cycle
E)   nitrogen cycleF) A) and B)
G) None of the above

Question 2

Species that are the first to colonize an area are termed ________ species.

Accepted Answer

A)   keystone
B)   primary
C)   tertiary
D)   pioneer
E)   secondaryF) B) and D)
G) B) and E)

Question 3

Tropical rain forest soils are usually

Accepted Answer

A)   nutrient-rich.
B)   low in organic matter.
C)   nutrient-poor and low in organic matter.
D)   nutrient-rich and low in organic matter.
E)   nutrient-poor.F) A) and C)
G) A) and B)

Question 4

The different seasons of the year are caused by the

Accepted Answer

A)   tilt of the Earth's axis as the Earth travels around the Sun.
B)   rotation of the Earth around the Sun.
C)   rotation of the Earth on its axis.
D)   rotation of the moon around the Earth.
E)   gravitational pull of the moon as it travels around the Earth.F) None of the above
G) A) and B)

Question 5

An organism that can use solar energy and inorganic substances to produce all the organic material it requires is a(n)

Accepted Answer

A)   primary producer and heterotroph.
B)   heterotroph.
C)   autotroph and primary producer.
D)   autotroph.
E)   primary producer.F) All of the above
G) A) and C)

Question 6

A relationship between different species in which one species lives in or on another is

Accepted Answer

A)   resource partitioning.
B)   coevolution.
C)   symbiosis.
D)   predation.
E)   niche sharing.F) A) and D)
G) A) and C)

Question 7

The Earth has a constant tilt of ________ on its axis from its plane of orbit.

Accepted Answer

A)   12.5 degrees
B)   23.5 degrees
C)   30 degrees
D)   9 degrees
E)   5.5 degreesF) A) and D)
G) B) and C)

Question 8

The term abiotic means nonliving.

Accepted Answer

A) True 
 B)False

Question 9

Scientists observed that over the past 40 years,marmots,a type of ground squirrel,are located at increasing elevations on mountains.What is the best explanation for this observation?

Accepted Answer

A)   The marmots are adapting to the cold temperatures.
B)   Other species are competing with the marmots for their normal habitat.
C)   More snow and rain is falling at the top of the mountains.
D)   It is becoming colder at the top of the mountains.
E)   It is becoming warmer at the top of the mountains.F) A) and C)
G) A) and B)

Question 10

Some scientists predict that as atmospheric carbon dioxide levels increase,plant growth will also increase.What is the best explanation for this hypothesis?

Accepted Answer

A)   Plants consume carbon dioxide from the atmosphere during photosynthesis.
B)   Plants release carbon dioxide into the atmosphere during photosynthesis.
C)   Plants consume carbon dioxide from the atmosphere during respiration.
D)   Plants release carbon dioxide into the atmosphere during respiration.
E)   No answer is correct.F) A) and B)
G) A) and E)

Question 11

In ecology,a ________ community is one that remains fairly constant over time.

Accepted Answer

A)   punctuated
B)   climax
C)   keystone
D)   primary
E)   tertiaryF) None of the above
G) B) and D)

Question 12

The ________ states that two species cannot coexist indefinitely in the same niche.

Accepted Answer

A)   endosymbiotic theory
B)   zonal exclusion theory
C)   co-inclusion principle
D)   second law of thermodynamics
E)   competitive exclusion principleF) C) and E)
G) B) and D)

Question 13

The concentration of the pesticide DDT is likely lowest in which organism?

Accepted Answer

A)   a seagull
B)   a minnow
C)   a mosquito larvae
D)   algae
E)   planktonF) A) and E)
G) C) and D)

Question 14

As you climb the mountain,why are the biomes changing?

Accepted Answer

A)   The air is thinner.
B)   The latitude is changing.
C)   More rain falls in a rain shadow.
D)   Some animals live better at higher elevations.
E)   It is colder.F) A) and C)
G) A) and B)

Question 15

Decomposers

Accepted Answer

A)   obtain nutrients from detritus.
B)   return organic molecules to their inorganic form.
C)   include bacteria.
D)   include fungi.
E)   All answers are correct.F) A) and E)
G) A) and C)

Question 16

On Earth,solar energy is most intense at

Accepted Answer

A)   the South Pole.
B)   the North Pole.
C)   60°N latitude.
D)   the equator.
E)   60°S latitude.F) B) and C)
G) C) and D)

Question 17

The photic zone

Accepted Answer

A)   has the most nutrients closer to land.
B)   is an area with sufficient light for photosynthesis.
C)   has an abundance of photosynthetic organisms.
D)   is very shallow.
E)   All of the answer choices are correct.F) B) and E)
G) All of the above

Question 18

Based on the 10% rule,if there are 10,000 calories of net primary productivity in an ecosystem,how much energy will be generally available to a secondary consumer?

Accepted Answer

A)   1,000 calories
B)   100 calories
C)   10,000 calories
D)   10 calories
E)   1 calorieF) A) and B)
G) A) and C)

Question 19

Streams lead to rivers that carry water and sediment toward the ocean or an interior basin.

Accepted Answer

A) True 
 B)False

Question 20

The remaining energy in the producer level that is available for consumers is the

Accepted Answer

A)   net primary consumption.
B)   gross primary production.
C)   gross primary consumption.
D)   net primary production.
E)   net energy fixation.F) A) and C)
G) C) and D)

Exam 19: Communities and Ecosystems

Scientists observed that over the past 40 years,marmots,a type of ground squirrel,are located at increasing elevations on mountains.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

The Earth has a constant tilt of ________ on its axis from its plane of orbit.

Correct AnswerverifiedShow Answer

Streams lead to rivers that carry water and sediment toward the ocean or an interior basin.

Correct AnswerverifiedShow Answer

Species that are the first to colonize an area are termed ________ species.

Correct AnswerverifiedShow Answer

In ecology,a ________ community is one that remains fairly constant over time.

Correct AnswerverifiedShow Answer

Which is not an important biogeochemical cycle on Earth?

Correct AnswerverifiedShow Answer

Based on the 10% rule,if there are 10,000 calories of net primary productivity in an ecosystem,how much energy will be generally available to a secondary consumer?

Correct AnswerverifiedShow Answer

Decomposers

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The concentration of the pesticide DDT is likely lowest in which organism?

Correct AnswerverifiedShow Answer

A relationship between different species in which one species lives in or on another is

Correct AnswerverifiedShow Answer

The photic zone

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The remaining energy in the producer level that is available for consumers is the

Correct AnswerverifiedShow Answer

On Earth,solar energy is most intense at

Correct AnswerverifiedShow Answer

An organism that can use solar energy and inorganic substances to produce all the organic material it requires is a(n)

Correct AnswerverifiedShow Answer

The ________ states that two species cannot coexist indefinitely in the same niche.

Correct AnswerverifiedShow Answer

The term abiotic means nonliving.

Correct AnswerverifiedShow Answer

The different seasons of the year are caused by the

Correct AnswerverifiedShow Answer

Tropical rain forest soils are usually

Correct AnswerverifiedShow Answer

Some scientists predict that as atmospheric carbon dioxide levels increase,plant growth will also increase.What is the best explanation for this hypothesis?

Correct AnswerverifiedShow Answer

As you climb the mountain,why are the biomes changing?

Correct AnswerverifiedShow Answer

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