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These questions deal with CARRYING CAPACITY. Enter (1) YOUR PERIOD followed by (2) FIRST & LAST NAME.

• 1.

The graph below shows the changes in the size of a fish population over a period of time. The dashed line on the graph represents the

• A.

Carrying capacity of the environment

• B.

Life span of the species

• C.

Level at which extinction is reached

• D.

Level of maximum biodiversity of the species

A. Carrying capacity of the environment
Explanation
The dashed line on the graph represents the carrying capacity of the environment. Carrying capacity refers to the maximum number of individuals of a species that can be supported by the available resources in a particular habitat. In this context, the graph shows how the fish population size fluctuates over time in relation to the carrying capacity. When the population size exceeds the carrying capacity, the population may decline due to limited resources. Conversely, when the population size is below the carrying capacity, there may be room for growth. The dashed line serves as a reference point to understand the relationship between the fish population and its environment.

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• 2.

Which graph represents a population that grew and is maintained at the carrying capacity of its ecosystem?

D.
Explanation
The correct answer is a plateau-shaped graph. This is because a population that has reached its carrying capacity will experience a stable population size over time. The plateau shape indicates that the population has reached a point where the birth rate equals the death rate, resulting in a constant population size.

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• 3.

C.
• 4.

The dotted line on the graph below represents the potential size of a population based on its reproductive capacity. The solid line on this graph represents the actual size of the population. Which statement best explains why the actual population growth is less than the potential popu- lation growth?

• A.

Resources in the environment are limited.

• B.

More organisms migrated into the population than out of the population.

• C.

The birthrate gradually became greater than the death rate.

• D.

The final population size is greater than the carrying capacity.

A. Resources in the environment are limited.
Explanation
The correct answer is "Resources in the environment are limited." This means that the population growth is limited because there are not enough resources available to support the potential size of the population. This could include factors such as limited food, water, shelter, or other essential resources necessary for the population's survival and growth.

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• 5.

Changes in a deer population are shown in the graph below. Which statement best explains section X?

• A.

The population has reached the carrying capacity of its environment.

• B.

Energy is used for interbreeding between members of different species.

• C.

A predator recycles the remains of dead organisms.

• D.

Competition does not occur between members of different species in the same habitat.

A. The population has reached the carrying capacity of its environment.
Explanation
Section X on the graph shows a plateau where the population remains relatively stable over time. This suggests that the population has reached its carrying capacity, which is the maximum number of individuals that the environment can support. At carrying capacity, the birth rate is equal to the death rate, resulting in a stable population size.

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• 6.

Students conducting a study on an insect population placed 25 insects of the same size in a box. The amount of food, water, and shelter available to the insects was kept constant. Each month, students removed and counted the number of insects present, recorded the total, and returned the insects to the box. The graph below shows the number of insects in the box over a 12- month period. What inference can be made regarding this insect population?

• A.

All the insects in the box are the same age.

• B.

The insects hibernated from January to April.

• C.

The population has carnivorous members.

• D.

The population reached carrying capacity by January.

D. The population reached carrying capacity by January.
Explanation
The graph shows that the number of insects in the box remained relatively stable after January, indicating that the population reached its carrying capacity. This means that the environment was able to support a maximum number of insects and the population size remained constant. The fact that the population size did not increase or decrease significantly suggests that the resources available (food, water, and shelter) were sufficient to sustain the population.

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• 7.

The size of a mouse population in a natural ecosystem tends to remain relatively constant due to

• A.

The carrying capacity of the environment

• B.

The lack of natural predators

• C.

Cycling of energy

• D.

Increased numbers of decomposers

A. The carrying capacity of the environment
Explanation
The size of a mouse population in a natural ecosystem tends to remain relatively constant due to the carrying capacity of the environment. Carrying capacity refers to the maximum number of individuals that a particular environment can support sustainably. As the mouse population approaches the carrying capacity, resources such as food, water, and shelter become limited, which leads to increased competition and a decrease in population growth. This balance helps to regulate the population size and prevent it from exceeding the available resources in the ecosystem.

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• 8.

The carrying capacity for herbivores in a habitat is most directly affected by the availability of

• A.

Heat energy released by carnivores

• B.

Carbon dioxide in the atmospHere

• C.

Decomposers in the soil

• D.

AutotropHs in the habitat

D. AutotropHs in the habitat
Explanation
The carrying capacity for herbivores in a habitat is most directly affected by the availability of autotrophs in the habitat. Autotrophs, such as plants, are the primary producers in an ecosystem and provide the energy and nutrients that herbivores rely on for survival. The abundance and productivity of autotrophs determine the amount of food available for herbivores, which in turn affects their population size and carrying capacity. Without a sufficient supply of autotrophs, herbivores would not have enough resources to support their population, leading to a decrease in their carrying capacity.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Oct 17, 2011
Quiz Created by
Ionca

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