Refer to the Graph

question 71

Multiple Choice

Refer to the graph. In the FACE experiment in a North Carolina forest, the amount of tree growth (change in carbon biomass per square meter) was measured under conditions of ambient CO₂ (270 ppm in 2000, when measurements were done) and elevated CO₂ (550 ppm) .Half of both the ambient and elevated plots were given additional nitrogen (fertilized) ; the other half were not (unfertilized) .According to the results shown, what can be concluded about the effectiveness of elevated CO₂ on increasing rate of tree growth?

• A) Elevated CO₂ increases tree growth in all cases.
• B) Elevated CO₂ increases tree growth only when they are fertilized as well.
• C) Elevated CO₂ has little effect on tree growth at any time.
• D) Elevated CO₂ increases tree growth most when trees are unfertilized.
• E) Tree growth is highest under ambient, not elevated, CO₂ levels.

Recognize the role of market forces in moving prices toward equilibrium in the absence of government intervention.

Explain how changes in market conditions affect equilibrium through graphical analysis.

Understand the impact of simultaneous changes in supply and demand on equilibrium.

Understand the impact of changes in demand and supply on equilibrium price and quantity.