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Multiple Choice
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1

The effect of water temperature on a fish in a stream would be classified as a (an)
A)biotic factor.
B)abiotic factor.
C)niche.
D)None of the above.
2

Interacting groups of species are
A)organisms.
B)populations.
C)communities.
D)ecosystems.
3

Cattle that feed on grass occupy which trophic level?
A)first
B)second
C)third
D)fourth
4

A blade of grass that contains 100 units of energy is eaten by a rabbit, and the rabbit consumed by a red fox. How many of the original energy units does the fox obtain?
A)100
B)50
C)10
D)1
5

An ecosystem has grass as a dominant organism but there are a few scattered trees and the rainfall comes at one part of the year. What biome is it?
A)boreal forest
B)savanna
C)prairie
D)desert
6

Which of the following is an abiotic component of an ant's niche?
A)the moisture of the soil the ant occupies
B)the ant's prey
C)the ant's predators
D)organisms that parasitize the ant
7

A lion eating a gazelle is an example of
A)an organism at the third trophic level.
B)predator/prey interaction.
C)part of the niche of the gazelle.
D)All of the above are true.
8

In an ecosystem there are fewer organisms at the third trophic level than at the second because
A)those at the third trophic level are larger in body size.
B)of the law of conservation of energy.
C)some of the energy at the second trophic level was lost to the environment as heat.
D)none of the above is correct.
9

An epiphytic plant living on another plant is an example of
A)predation.
B)competition.
C)parasitism.
D)commensalisms.
10

Neighboring trees utilizing the same soil water is an example of
A)predation.
B)competition.
C)parasitism.
D)commensalisms.
11

Increased amounts of _____ in the atmosphere may lead to an increase in the earth's temperature through a process termed "global warming."
A)oxygen gas
B)nitrogen gas
C)hydrogen gas
D)carbon dioxide
12

Nitrogen is made available to plants by
A)nitrogen fixing bacteria.
B)ammonia.
C)nitrate.
D)All of the above are true.
13

You would find phytoplankton in
A)the euphotic zone.
B)the ocean.
C)freshwater.
D)All of the above are true.
14

The portion of the population growth curve that best estimates an environment's carrying capacity is the
A)lag phase.
B)natality.
C)stable equilibrium phase.
D)exponential growth phase.
15

The major producers in marine ecosystems are
A)benthic organisms.
B)zooplankton.
C)phytoplankton.
D)the euphotic zone.
16

All of the following have allowed humans to increase the earth's carrying capacity for human beings except
A)birth control methods.
B)antibiotics.
C)elimination of competitors.
D)improved agricultural yields.
17

Which of the following could result in increases in human populations even if the total fertility rate is less than replacement level fertility?
A)high death rate
B)small numbers of immigrants
C)elevated infant mortality
D)large proportion of the population in the pre-reproductive stage
18

All organisms have organic molecules as a major component of their chemical composition. The carbon atoms in these organic molecules
A)come from the atmosphere.
B)are captured by sunlight.
C)are made by the producers.
D)increase at higher trophic levels.
19

What biome is characterized by long, severe winters, no trees, and low numbers of animals?
A)tropical rainforest
B)temperate deciduous forest
C)tundra
D)savanna
20

What percentage of energy is lost in each trophic transfer?
A)10%
B)50%
C)75%
D)90%
21

The oxygen gas in the atmosphere
A)constitutes about 80% of the atmosphere.
B)is the result of photosynthesis.
C)is the result of aerobic respiration.
D)is high during the summer and low during the winter.
22

A lion eats a gazelle, is pestered by flies, travels long distances to find prey, sleeps during much of the day, and generally hunts within a specific region. This is a partial description of a lion's
A)habitat.
B)community.
C)niche.
D)ecosystem.
23

Which one of the following populations is likely to grow rapidly, one
A)that has reached its carrying capacity.
B)with a high birth rate and a high death rate.
C)with a large number of reproductive individuals and a low death rate.
D)in which the number of offspring produced per female is low.
24

Nitrogen-fixing bacteria
A)live in the soil.
B)return nitrogen gas to the atmosphere.
C)capture carbon through the process of photosynthesis.
D)have very small populations.
25

Farmers remove weeds from fields because weeds
A)are poor producers.
B)compete with the crop plants.
C)do not produce nitrogen for the soil.
D)do not carry on photosynthesis as efficiently as the crop plants.





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