Succession — Unit test Answers

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1
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For which method of determining population size is the population not aware of the sampler’s presence?

A
mark/recapture
B
direct observation
C
sampling
D
indirect observation
2
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There are approximately 35,000 bald eagles in Alaska, which covers 586400 square miles. What is the population density for the bald eagles in Alaska?

A
17 bald eagles per square mile
B
0.04 bald eagles per square mile
C
0.06 bald eagles per square mile
D
1 bald eagle per square mile
3

The total number of organisms an ecosystem can support is its tolerance range.

A
T
B
F
4

Orange trees planted in a grove or orchard would most likely fall in which category of population distribution?

A
even
B
random
C
clumped
D
density
5

Succession allows ecosystems to _______.

A
recover from disruptive events
B
reach a stable and sustainable point
C
establish complex communities
D
all of the above
6

The negative impacts of nonnative species generally outweigh the positive impacts.

A
T
B
F
7

Succession occurs because _______.

A
organisms gradually change the environment
B
climax communities are not possible
C
dominant organisms drive out pioneer species
D
ecosystems never reach a sustainable point
8

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?

A
Some species might become invasive and destructive if they escaped.
B
Some species may be dangerous to humans.
C
Nonnative plants and animals should only be used for commercial purposes.
D
There is no reason to restrict an individuals’ right to own plants or animals.
9

Which of the following statements about secondary succession is true?

A
Secondary succession occurs in ecosystems that have no vegetation.
B
Secondary succession affects ecosystems that are already established.
C
Ecosystems require pioneer species to undergo secondary succession.
D
Secondary succession can occur in areas without soil.
10

Which of the following conditions would lead to a small population size?

A
a low birth to death ratio
B
a high birth to death ratio
C
immigration
D
large number of resources
11

Which of the following is true concerning hull fouling from commercial shipping and recreational boating?

A
It constitutes less than half of all nonnative species introductions.
B
The revenue brought in from these industries is relatively small.
C
It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.
D
It is best combated by chemical treatments.
12

Which of the following statements about logistic growth curves is true?

A
Logistic growth curves are common for R-selected species.
B
Logistic growth curves are J-shaped.
C
No organisms in nature experience logistic growth rates.
D
Logistic growth curves increase exponentially at first, then experience slowed growth rates.
13

Why is it important to look at the combination of birth and death rates when considering population size?

Answer not available
14

Explain how the method of mark and recapture works to determine population size.

Answer not available
15

Population density is calculated by _______.

A
dividing the number of organisms in a region by the land area
B
multiplying the number of organisms in a region by the land area
C
dividing the land area by the number of organisms in the region
D
by subtracting the land area from the number of organisms in a region
16

New Zealand has a population of 4,326,380 and has an area of 103,736 mi while Australia has an area of 2,967,909 mi and a population of 21,905,140. Calculate the population density for New Zealand and Australia. Round the population densities to the nearest whole number.

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Answer not available
17

How do the biotic and abiotic limiting factors of an ecosystem determine its carrying capacity?

Answer not available
18

Based on California’s experience with Caulerpa, the killer algae, explain why it is important to regulate the pet and aquarium trade.

Answer not available

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