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Succession and Extinction — Unit test Answers

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1
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Which of the following could result in secondary succession?

A
the formation of a tall sand dune on a previously grassy beach
B
a vast glacier in motion forming a U-shaped valley in its wake
C
a volcanic eruption that covers most of what used to be a forest
D
an introduced species that destroys all the native plants in an area
2
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A family released their pet fish family into a local pond. The fish had no known local population. The impact of the fish on the ecosystem is not yet known. Which term would best define the fish added to the pond?

A
invasive species
B
introduced species
C
native species
D
symbiotic species
3

Barnacles and whales have a commensalistic relationship in which barnacles benefit. What would most likely happen to the whale population if the barnacle population decreased?

A
become extinct
B
decrease
C
increase
D
stay the same
4

How does mining impact the environment?

A
It has a positive impact on the environment by permanently altering the ecosystem.
B
It has a positive impact on the environment by releasing chemicals into the environment.
C
It has a negative impact on the environment by allowing toxic chemicals to harm wildlife.
D
It has a negative impact on the environment by providing new niches for wildlife to inhabit.
5

If the producer population in an ecosystem decreased, what would most likely happen to the size of the herbivore population?

A
It would decrease.
B
It would double.
C
It would stay the same.
D
It would triple.
6

Which best describes what happens when an animal does not form a social group?

A
Foraging is more difficult when hunting a large prey.
B
Reproduction is easier because of access to multiple mates.
C
Fighting off predators is easier with one individual.
D
The division of labor is more difficult as it increases competition.
7

How do limiting factors most affect population size?

A
stop population growth
B
restrict population growth
C
increase population growth
D
decrease population growth
8

Darius made a diagram to compare and contrast two benefits of social behavior.

Question illustration
A
keeps group safe from predators
B
helps take down prey
C
divides jobs within group
D
increases chances of survival
9

How does conservation affect biodiversity?

A
It helps to preserve climate change.
B
It decreases species diversity.
C
It helps to preserve biodiversity.
D
It decreases ecosystem diversity.
10

Which best describes the relationship between two species and a niche?

A
If two species have the same niche, one species will always become extinct.
B
Two species are able to occupy the same niche in the same habitat.
C
Two species cannot occupy the same niche in the same habitat.
D
If two species have the same niche, one species will always move.
11

A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

A
It is increasing.
B
It is decreasing.
C
It is staying the same.
D
It reaches carrying capacity.
12

Which animals form a eusocial society?

A
ants
B
cheetahs
C
polar bears
D
moose
13

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
14

Pandas eat bamboo for energy. What are pandas classified as?

A
producers
B
consumers
C
decomposers
D
autotrophs
15

Actinobacteria sp. are organisms called chemoorganohetereotrophs. They do not use oxygen to breathe. They break down organic material and convert it to inorganic material.Which part of the carbon cycle does this describe?

A
photosynthesis
B
respiration
C
decomposition
D
assimilation

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