AnswersCA-Life Science B High SchoolRelationships Among Organisms

Relationships Among Organisms Answers

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1
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Name the four factors that affect population growth. Then, explain how each factor contributes to population growth.

Answer:

The four factors that affect population growth are birth rate, immigration, death rate, and emigration. Birth rate and immigration add individuals to the population, increasing its size. Death rate and emigration remove individuals from the population, decreasing its size. Population growth = (birth rate + immigration) − (death rate + emigration).

2
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Which of the following did you include in your response? Check all that apply.

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
4

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

Answer:

Both models describe population growth and initially increase at a constant rate. Exponential growth continues when resources are unlimited, while logistic growth slows as resources become scarce and the population approaches carrying capacity.

6

What occurred in the population from 1800 to 1925?

A
The population grew exponentially.
B
The population remained near carrying capacity.
C
The population crashed.
7

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.

A
The pond can support a population size of 125 goldfish.
B
The pond can support a population size of 110 goldfish.
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.
9

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

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.

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