Resource availability in Ecosystems

Why did the population level off as shown?

• The resources ran out.

• Predators were introduced into the ecosystem

• Competition limited resources for the population

• The population encountered a new disease

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

If this is the only change, which causes a population to increase in size?

• The birth rate and death rate both equal zero

• The birth rate is greater than the death rate

• The birth rate is less than the death rate

• The birth rate equals the death rate

Tags

NGSS.HS-LS2-6

A student creates a population graph. How will the graph look like if it shows logistic growth of an animal population over time.

• It will be a straight line that slants sharply downward

• It will be a straight line that slants sharply upward

• It will be an essentially flat, horizontal line

• It will be a vertical line

Tags

NGSS.MS-LS2-4

Which of these is the most likely reason that a population in an ecosystem could have a sharp decline?

• The abiotic resources in the environment suddenly drops

• The competition for the same resource suddenly drops

• The number of predators suddenly decreases

• The number of prey suddenly increases

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of these events can lead to an increase in a population size of mice?

• A large number of mice die because of a forest fire

• New predators are added to the ecosystem

• More mice are born than die

• Some mice emigrate in search of food

How can prey and predators be limiting factors for a population?

• Too many predators can limit a population

• Too little predators or too many prey can decrease a population

• Predators and prey limit popuations

• Too many predators or too little prey can decrease a population

Tags

NGSS.MS-LS2-4

How can a drought affect a population?

• Droughts affect plant life and animals also need water to drink

• Droughts only affect plants

• Droughts are a dangerous period of extreme rainfall

• Animals die of thirst

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

How does a drought affect carrying capacity (ability of resources to match population)?

• Populations increase because animals replaced plants

• Populations stayed the same because only biotic factors affect them

• The populations decrease because the resources ran out

• The populations increase and then decreased later

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What does logistic growth mean?

• It is when resources are no longer abundant and populations level off

• It is when resources are abundant and populations grow exponentially

• It is when resources are not abundant and populations die off

• It is when resources drop and populations drop

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What may cause exponential growth in a population?

• Resources are scarce

• Resources remain the same

• Resources become abundant

• Resources are buried

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4