Ch 3 Ecosystem ecology

Autotrophs

• use photosynthesis to attain energy

• are able to survive without oxygen

• are primary consumers

• are at the top of the food chain

A giraffe is an example of?

• a secondary consumer

• a producer

• a detrivore

• a primary consumer

If gross primary productivity in a wetland is 4 kg C/m2/ year and respiration is 2 kg C/m2/year, what is the net primary productivity of the wetland?

• 2 kg C/m2/ year

• 3 kg C/m2/ year

• 1.5 kg C/m2/ year

• 8 kg C/m2/ year

The average efficiency of energy transfer between trophic levels is approximately?

• 1%

• 2%

• 10%

• 40%

gross primary productivity of an ecosystem is?

• the total amount of biomass

• the total energy captured by photosynthesis

• the energy captured after accounting for respiration

• the energy available to primary consumers

Which one of the following is fixed from the atmosphere by bacteria?

• Magnesoim

• phosphorous

• sulfur

• nitrogen

human construction of buildings and pavement affect the hydro-logical cycle by

I) increasing runoff

II) increasing evaporation

III) increasing percolation

• I only

• II only

• I and II only

• I, II and III

The largest carbon pool is found in

• oceans

• atmosphere

• sedimentary rock

• living organisms

Phosphorous

• is a limiting nutrient in many aquatic systems.

• has an important gaseous phase.

• is easily lost from soils due to leaching.

• is often produced by volcanic eruptions.

Acid rain is associated with which geochemical cycle?

• Potassium

• Calcium

• Carbon

• Sulfur