Home Page Textbooks Prentice Hall Biology (California) Page 137: Standards Practice

Prentice Hall Biology (California)

1st Edition

Kenneth R. Miller, Levine

ISBN: 9780132013529

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Page 137: Standards Practice

Exercise 1

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The population growth rate refers to the total change in population over time. The population size may go up or down depending on the individuals that are added or removed from it.

Result

2 of 2

D. population growth rate

Exercise 2

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Immigration is an act of moving to a place occupied by an existing population which causes the population to increase, while birthrate refers to the number of babies born for every 1000 people. Both immigration and birthrate causes a change in population by increasing it.

Result

2 of 2

D. II and III only

Exercise 3

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Choices B, C, D and E are all density-dependent limiting factor. Therefore, A is the correct answer.

Result

2 of 2

A. natural disasters

Exercise 5

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A demographic transition is marked complete once the birthrate meet with the death rate. This means that the population growth stops.

Result

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D. II and III only

Exercise 6

Solution 1

Solution 2

Step 1

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When there are plenty of resources, population of the bacteria will grow exponentially. This means that the growth rate increases at a constant rate.

Result

2 of 2

B. exponential growth

Step 1

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Under ideal circumstances, such as unlimited resources and the absence of predation and disease, a population would be able to exhibit **exponential growth** due to lack of limiting factors.

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However, in reality, resources are often limited and members of the population would often compete for resources. Hence, populations in nature would not exhibit exponential growth.

Result

3 of 3

Exercise 7

Solution 1

Solution 2

Step 1

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I and II only (Carrying capacity reached; birthrate equals death rate)

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The given diagram illustrates the logistic growth of a population. As shown in the diagram, the time interval marked E appears to plateau in a zigzag pattern instead of going higher to the right.

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The pattern exhibited by the interval E suggests that the population has reached its *carrying capacity*. Additionally, this also means that the population’s birth rate is now *equal* to its death rate, and thus the population would not grow any further.

Result

3 of 3

Exercise 8

Solution 1

Solution 2

Step 1

1 of 2

Interval A and B resemble a J-shaped curve which indicates an exponential growth.

Result

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B. A and B

Step 1

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In a graph that illustrates logistic growth, the time interval that shows exponential growth appears as a curve that rapidly rises to the right, which shows a rapid population growth over time.

Step 2

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In the given graph, the time interval that shows exponential growth would be **A and B**. Once the graph reaches interval C, the growth of the population then appears to slow down over time.

Result

3 of 3

Exercise 9

Solution 1

Solution 2

Step 1

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Interval C, D, and E resemble a logistic growth. When there are limited resources or limiting factors present, a logistic growth will occur. As a result, the growth rate decreases.

Result

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C. C, D, and E

Step 1

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Interval C, D, and E

Exercise 10

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When the birthrate equals with the death rate, the population growth slows down. As a result, a logistic growth occurs.

Result

2 of 2

B. logistic growth

Exercise 11

Solution 1

Solution 2

Step 1

1 of 1

Limiting factor

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Factors that slow down the growth of a particular population are known as **limiting factors**. Some examples of limiting factors include predation, disease, and natural disasters.

Step 2

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The intensity of limiting factors may be influenced by the density of the population, and thus are considered as *density-dependent*. Otherwise, they are known as *density-independent*.

Result

3 of 3

Exercise 12

Solution 1

Solution 2

Step 1

1 of 1

Population density

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The number of individual organisms in a specific unit of area is known as the **population density**. Some species may exhibit high population density while others may exhibit low density.

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For instance, bacterial populations usually exhibit high population density since there can be billions of bacterial cells present in a very small area such as a few square centimeters.

Result

3 of 3

Exercise 13

Step 1

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An exponential growth is an increasing growth rate in which the people in a population reproduce at a constant rate due to a great number of resources.

Result

2 of 2

D. exponential growth

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Page 137: Standards Practice

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