Factors Affecting the Size of a Population

Question 1

What is population size?

Answer 1

• the total number of individuals in a population

Question 2

What factors affect the size of a population?

Answer 2

• natality
• mortality
• immigration
• emigration

Question 3

What is natality?

Answer 3

• the birth rate in animals or the production of seeds in plants

Question 4

What is mortality?

Answer 4

• the death rate

Question 5

What is immigration?

Answer 5

• individuals move into a population and stay

Question 6

What is emigration?

Answer 6

• individuals leave a population and do not return

Question 7

What is the birth rate in humans?

Answer 7

• the number of births per 1000 people in a year

Question 8

What is the death rate in humans?

Answer 8

• the number of deaths per 1000 people in a year

Question 9

When do populations grow?

Answer 9

• when birth and immigration exceed death and emigration

Question 10

When do populations decline?

Answer 10

• when death and emigration exceed birth and immigration

Question 11

When do populations remain stable?

Answer 11

• when birth and immigration approximately equal death and emigration