Relationships Among Organisms

Question 1

Name the four factors that affect population growth. Then, explain how each factor contributes to population growth.

Revolt · Accepted Answer

The four factors that affect population growth are birth rate, death rate, immigration, and emigration. Birth rate and immigration both add individuals to a population, which increases its size. Conversely, death rate and emigration both remove individuals from a population, which decreases its size. Total population growth is calculated as (birth rate + immigration) - (death rate + emigration).

Question 2

How are exponential and logistic growth models similar? How are they different?

Revolt · Accepted Answer

Both exponential and logistic growth models describe population increases over time, and both typically begin with a period of rapid growth. They are similar because they both initially show a population growing at a constant rate. However, they differ in how they respond to resource availability. Exponential growth occurs when resources are unlimited, while logistic growth occurs when resources become scarce. In logistic growth, a period of exponential growth is followed by a slowing or stopping of growth as the population reaches the environment's carrying capacity.

Question 3

According to the graph on the right, what is the approximate carrying capacity of the white-tailed deer population?

Revolt · Accepted Answer

C: 600,000 deer

Question 4

What occurred in the population from 1800 to 1925?

Revolt · Accepted Answer

C: The population crashed.

Question 5

There are 110 goldfish in the pond when the availability of resources decreases. The carrying capacity drops from 125 to 90 goldfish. Which of the following statements is true under these conditions? Check all that apply.

Revolt · Accepted Answer

C: The pond can support a population size of 90 goldfish.; D: The pond can support a population size of 75 goldfish.; E: The pond can support a population size of 50 goldfish.

Question 6

What is the approximate carrying capacity of the population? In which year, did the population reach the carrying capacity? About how many years did it stay at carrying capacity?

Revolt · Accepted Answer

D: 250 individuals

Question 7

Which of the following did you include in your response? Check all that apply.

Revolt · Accepted Answer

A: The four factors are birth rate, immigration, death rate, and emigration.; B: Birth rate and immigration add individuals to the population, increasing the size.; C: Death rate and emigration remove individuals to the population, decreasing the size.; D: (birth rate + immigration) – (death rate + emigration) = population growth

Question 8

Which of the following did you include in your response? Check all that apply.

Revolt · Accepted Answer

A: Both growth models begin with a population that is growing at a constant rate.; B: Logistic growth follows a period of exponential growth, as population growth slows or stops.; C: Exponential growth is only possible when resources are unlimited.; D: Logistic growth shows what happens when resources become scarce and population growth slows.

Question 9

In which year, did the population reach the carrying capacity?

Revolt · Accepted Answer

B: year 3

Question 10

About how many years did it stay at carrying capacity?

Revolt · Accepted Answer

C: 4 years

Relationships Among Organisms Answers

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