IB ESS

When does an ecological footprint show unsustainability?

• When the ecological footprint is greater than the area available to the population.

• An ecological footprint cannot show unsustainability.

• When the ecological footprint is smaller than the area available to the population.

• When the value of the ecological footprint is greater than 50.

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An ecological footprint is a type of a model – what exactly does it reflect?

• The hypothetical area of land required by a population to obtain all the resources needed and assimilate all their wastes.

• The point at which a resource can no longer be exploited without rendering it non-renewable.

• The measure of all waste created by a population at a given period of time.

• The maximum size of a population that an environment can support without detrimental effects.

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The diagram below shows the use of natural resources.

Does it demonstrate sustainable or unsustainable management of those resources?

• Unsustainable

• Sustainable

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How do CFCs affect ozone production?

• UV radiation frees a chlorine atom, which breaks down ozone.

• Infrared radiation frees a chlorine atom, which breaks down ozone.

• UV radiation frees a fluorine atom, which breaks down ozone.

• Infrared radiation frees a chlorine atom, which breaks down ozone.

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Location of the large whole in the ozone.

• Antarctica

• Artic

• Iceland

• Africa

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The breakdown of stratospheric ozone;

I. Can originate from the emission of chlorofluorocarbons (CFCs).

II. Is catalyzed through a free chlorine (Cl) atom.

III. Prevents all UV rays from reaching the earth’s surface.

• I only

• III only

• I,&II

• I,II,& III

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Which agreement allowed for a reduction, and eventual elimination, of CFC production and use?

• Montreal Protoccol

• Kyoto Protoccol

• Paris Agreement

• Minamata convention

Though CFC production has been curtailed, the threat to upper atmosphericozone continues because CFCs

• become harmless quickly.

• destroy ozone for only a short time.

• persist but stop destroying ozone.

• persist and continue to destroy ozone for decades.

Which is NOT a result of the reduction in stratospheric ozone?

• reduced photosynthetic activity

• increased skin cancer

• increased likelihood of cataracts

• increased birth defects

Which is true about ozone formation and destruction? select all that apply

• Its formation and destruction is an example of a dynamic process in nature.

• It forms when a free oxygen atom reacts with a molecule of oxygen.

• UV radiation breaks up ozone by splitting off an oxygen atom.

• Ozone cannot reform once it absorbs UV radiation.

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