IB ESS Unit 3

Which are consequences of stratospheric ozone depletion? (select all that apply)

• cataracts

• skin cancer

• phytoplankton population increase

• decreased crop yield

• wrinkling/aging/burning of skin

Tags

NGSS.HS-LS4-5

Which is most strongly absorbed by ozone in the statosphere?

• UV-A

• UV-B

• UV-C

• UV-B and UV-C

• UV-A and UV-B

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?

• CFCs

• HFCs

• DDT

• CFCl2

Tags

NGSS.HS-ESS2-4

NGSS.HS-ESS3-6

Polar Ice Caps are melting due to an increase in Earth's temperature. This lowers the albedo of Earth, which in turn increases Earth's temperature. This is an example of what type of feedback?

• Negative

• Neutral

• Positive

• Ecosystem

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS3-5

The ability of an ecosystem to recover quickly and resist damage after disasters

• Ecology

• Environmental Science

• Biodiversity

• Ecosystem Resilience

Tags

NGSS.HS-LS2-6

Which type of feedback is shown in the figure below?

• positive feedback loop

• negative feed back loop

• neutral feed back loop

• tipping point

Answer explanation

This feedback will amplify the change in the system. Once the vegetation cover is removed it will cause more vegetation cover to be removed. So accelerating the change in the system.

Tags

NGSS.HS-ESS2-2

A tipping point is part of a system that kick starts self-perpetuating positive feedback loops that push the systems to a new state of equilibrium. If tipping points are reached in the natural environment, which one of the following could happen?

• Land and seas’ food production capacity could be compromised.

• The climate may become unsuitable for human existence.

• Environmental support services could collapse.

• All of these are possible outcomes of tipping points in the natural environment.

Answer explanation

Are any of these outcomes more significant than the others? or are they all equally significant? Are all of these examples a possible result of reaching a tipping point or just one?

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS2-4

NGSS.HS-ESS3-1

NGSS.HS-ESS3-5

Which of the following explains why stability varies between ecosystems?

• Climate, limiting factors.

• Biodiversity, trophic complexity.

• Frequency and intensity of disturbances.

• All the responses are correct.

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5

What type of equilibrium is shown in the graph below?

Answer stable or unstable.

• Stable equilibrium

• Unstable equilibrium

Answer explanation

If the system is disturbed it will not return to its original state but find another one.

Tags

NGSS.HS-LS2-6

What is the best description for this image

• static equilibrium

• steady state equilibrium

• tipping point

• unstable equilibrium

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2