Population Dynamics

What is the best definition of a population?

• All living organisms in an ecosystem

• A group of the same species living in an area

• A collection of food sources in an environment

• A variety of different species in a habitat

What happens to a population if the birth rate is higher than the death rate?

• The population decreases

• The population stays the same

• The population increases

• The population disappears

Which of the following factors would cause a population to decrease?

• High birth rate

• More immigration

• Increased emigration

• Abundant food supply

A scientist counts 500 deer in a forest covering 50 km². What is the population density?

• 5 deer/km²

• 10 deer/km²

• 50 deer/km²

• 100 deer/km²

Which of the following is NOT a factor that affects population size?

• Birth rate

• Death rate

• Temperature of the sun

• Immigration

What is population density?

• The number of individuals per unit area

• The total number of individuals in the world

• The speed at which a population grows

• The number of different species in an ecosystem

What happens if immigration increases in an area?

• The population decreases

• The population increases

• The population disappears

• The population stays the same

A town has 1,000 people living in an area of 5 km². What is the population density?

• 50 people/km²

• 100 people/km²

• 200 people/km²

• 500 people/km²

What could happen if a population becomes too dense?

• More resources become available

• There is less competition for food

• The spread of disease increases

• The population size will never change

Which of the following is an example of emigration?

• Birds flying to a warmer region for the winter

• A population of deer giving birth to twins

• A group of fish moving into a new lake

• Humans moving into a new city for work