Ecosystem Resilience Test_25.26

1

What type of organism always starts the food chain in an ecosystem?

Producer

Consumers

Predators

Decomposers

1

Which of these ecosystems would be most likely to recover?

A temperate forest with average biodiversity that loses many types of trees due to a fire

A tropical rainforest with high biodiversity that loses a species of fig tree due to a type of fungus

A desert that has low biodiversity and loses all of the saguaro cacti that are growing there

A tundra with low biodiversity that loses many top predators due to ice melt

1

If an invasive species (a species from a different place) is brought into a new ecosystem and reproduces rapidly, how would that likely affect the ecosystem?

The resilience of the ecosystem would stay the same because the invasive species would have no effect on the native species.

The ecosystem would become less resilient because the invasive species would compete with native species.

The ecosystem's resilience would increase because the invasive species would support the native species.

The ecosystem would have more resilience because the invasive species would stop climate change.

1

Deforestation means cutting down many trees in an area. How does deforestation affect an ecosystem?

It increases the number of species.

It creates a new habitat for species to live.

It decreases the number of species.

It has no effect on the ecosystem.

1

What could happen if all of the sharks were gone from a marine ecosystem?

The other fish species would also decline.

Populations of other predators would increase rapidly.

Populations of fish that were food for sharks would increase.

The ecosystem would immediately recover.

1

An event, such as a storm, fire, flood, drought, overgrazing, or human activity, that changes an ecosystem and alters resource availability is called a...

biodiversity

disturbance

eutrophication

natural resources

1

Some damaged ecosystems can recover after a disturbance. Is this statement true or false?

Nokorɛ

Ɛnyɛ ampa

1

How is biodiversity beneficial to an ecosystem?

It is actually not beneficial to an ecosystem.

It makes the ecosystem unstable.

It increases competition.

It helps ecosystems remain stable.

1

Humans are part of the ecosystem and therefore impact it. Which of the following events in an ecosystem may produce a negative effect?

Preventing deer from decreasing their own food resources

Restoring a natural habitat

Wildlife rangers minimizing disturbances

A lumber company cutting down all the trees in a forest

1

Which is not a human impact on an ecosystem?

Pollution

Human population growth

Natural disasters

Overfishing

Climate change can make different environmental stresses stronger, sometimes pushing a species past the point where it can survive. From 2000 to 2003, a mix of extreme drought (little rain) and unusually high temperatures caused many piñon pines in the Four Corners region of the Southwest to die. Piñon pines are normally very good at surviving dry conditions, but the extra heat made the drought even worse. This weakened the trees and made them more vulnerable to attacks from pine bark beetles. In some areas, more than 90% of the piñon pines died, which led to big changes in the ecosystem.

Warmer winters are also causing more bark beetle outbreaks. Because the winters aren’t as cold, more beetles survive through the season and are able to reproduce, increasing their numbers and the damage they cause.

Two side by side photographs of a forested region. The photo on the left shows a combination of green and reddish trees. The photograph on the right shows many leafless grey trees. Line graph shows that the damages, measured in acres per fire, has increased from 1985 to 2009. Annual data varies, but the five year average line shows an increase from approximately 50 acres per fire in 1985 to over 100 acres per fire in 2009. This graph shows the area burned by wildfires every year from 1983 to 2008.

1

Ecosystem Resilience Test_25.26

What type of organism always starts the food chain in an ecosystem?

Which of these ecosystems would be most likely to recover?

If an invasive species (a species from a different place) is brought into a new ecosystem and reproduces rapidly, how would that likely affect the ecosystem?

Deforestation means cutting down many trees in an area. How does deforestation affect an ecosystem?

What could happen if all of the sharks were gone from a marine ecosystem?

An event, such as a storm, fire, flood, drought, overgrazing, or human activity, that changes an ecosystem and alters resource availability is called a...

Some damaged ecosystems can recover after a disturbance. Is this statement true or false?

How is biodiversity beneficial to an ecosystem?

Humans are part of the ecosystem and therefore impact it. Which of the following events in an ecosystem may produce a negative effect?

Which is not a human impact on an ecosystem?

What type of organism always starts the food chain in an ecosystem?

Which of these ecosystems would be most likely to recover?

If an invasive species (a species from a different place) is brought into a new ecosystem and reproduces rapidly, how would that likely affect the ecosystem?

Deforestation means cutting down many trees in an area. How does deforestation affect an ecosystem?

What could happen if all of the sharks were gone from a marine ecosystem?

An event, such as a storm, fire, flood, drought, overgrazing, or human activity, that changes an ecosystem and alters resource availability is called a...

Some damaged ecosystems can recover after a disturbance. Is this statement true or false?

How is biodiversity beneficial to an ecosystem?

Humans are part of the ecosystem and therefore impact it. Which of the following events in an ecosystem may produce a negative effect?

Which is not a human impact on an ecosystem?

Look at the graph. What has happened to the ecosystem disturbances over time?

Which of the following ecosystem disturbances affected piñon pines? (Select all that apply.)

Which statement best describes the resilience of the ecosystem in the Four Corners region?

Deer eat the nuts of piñon pine trees. After repeated wildfires in the Four Corners ecosystem, what most likely happened to the population of deer?

The piñon jay has a symbiotic relationship with the piñon pine. It helps to spread piñon pine seeds so new trees can grow. If humans take steps to conserve (protect) piñon jays in the ecosystem, how will that likely affect the resilience of the ecosystem?

Look at the graph. What has happened to the ecosystem disturbances over time?

Which of the following ecosystem disturbances affected piñon pines? (Select all that apply.)

Which statement best describes the resilience of the ecosystem in the Four Corners region?

Deer eat the nuts of piñon pine trees. After repeated wildfires in the Four Corners ecosystem, what most likely happened to the population of deer?

The piñon jay has a symbiotic relationship with the piñon pine. It helps to spread piñon pine seeds so new trees can grow. If humans take steps to conserve (protect) piñon jays in the ecosystem, how will that likely affect the resilience of the ecosystem?