Population Graphs

Question 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

Accepted Answer

carrying capacity of the environment

Answer

life span of the species

Answer

level at which extinction is reached

Answer

level of maximum biodiversity of the species

Question 2

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?

Accepted Answer

Resources in the environment are limited.

Answer

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

Answer

The birthrate gradually became greater than the death rate.

Answer

The final population size is greater than the
carrying capacity.

Question 3

Changes in a deer population are shown in the graph below.

Which statement best explains section X?

Accepted Answer

The population has reached the carrying capacity of its environment.

Answer

Energy is used for interbreeding between members of different species.

Answer

A predator recycles the remains of dead organisms.

Answer

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

Question 4

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?

Accepted Answer

The population reached carrying capacity by
January.

Answer

All the insects in the box are the same age.

Answer

The insects hibernated from January to
April.

Answer

The population has carnivorous members.

Question 5

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

Accepted Answer

the carrying capacity of the environment

Answer

the lack of natural predators

Answer

cycling of energy

Answer

increased numbers of decomposers

Question 6

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

Accepted Answer

autotrophs in the habitat

Answer

heat energy released by carnivores

Answer

carbon dioxide in the atmosphere

Answer

decomposers in the soil

Population Graphs

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

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

The graph below shows the growth of a field mouse population in an ecosystem over time. The dashed line indicating the carrying capacity for the mouse population is correctly shown on which graph?

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

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

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