Ecology Assessment #5

A forest is cut down and is replaced by a cornfield. A negative consequence of this practice is

• An decrease in the amount of carbon dioxide released

• an increase in the size of predators

• a decrease in biodiversity

• a decrease in the amount of soil that is washed away during rainstorms

Some organizations are buying up sections of forest land. Once purchased, these sections of forest will never be cut down. The main reason for protecting these sections of forest is to

• cause the extinction of undesirable species

• prevent the trees from reproducing too fast

• maintain the diversity of the living environment

• provide more land for agricultural processes

Wide-scale removal of trees would result directly in

• an increase in oxygen levels

• an increase in carbon dioxide levels

• an increase in nitrogen levels

• an increase in energy levels

Greenhouse gases are best described as our Planet's

• blankets to stay warm

• sunscreen to prevent radiation

• sunglasses to protect our eyes

• filters to clean our air

What is the primary cause of global warming?

• An increase in acid rain

• The loss of biodiversity

• The destruction of the ozone shield

• An increase of carbon dioxide as a result from burning fossil fuels

• nonrenewable and does not damage the atmosphere

• nonrenewable and damages the atmosphere

• renewable and damages the atmosphere

• renewable and does not damage the atmosphere

What has happened to CO2 over the last 200 years, and how has this affected temperature?

• CO2 has increased and so has the temperature.

• CO2 has decreased and so has the temperature.

• CO2 has increased and temperature has decreased.

• CO2 has stayed the same and so has the temperature.

Why is the ozone layer important?

• It allows harmful radiation from the sun to pass freely

• It protects us from UV radiation which causes mutations and cancer

• It keeps our planet warm and helps to trap heat

• It prevents radiation from leaving the earth and damaging the sun

What caused the depletion of the ozone layer?

• Carbon dioxide from burning fossil fuels

• A molecule used in manufacturing called a CFC

• Both of the above

• Methane and CO2 in the atmosphere