Plant Physiological Effects of a Changing Environment

2. Discuss the difference between C3 and C4 plants.

3. How does change in atmospheric CO₂ affect water-use efficiency? What does this imply for CO₂-induced climate change?

4. Discuss (perhaps with a graph) the atmospheric CO₂ concentration in the lower part of a forest

• before, during, and after the growing season.
• over a 24-hour period during the growing season.

5. Discuss the water-use efficiency of plants as a function of atmospheric CO₂ concentration.

6. Give the key factors and concepts that must be considered in determining the carrying capacity of planet Earth.

7. Discuss the meaning of NPP = GPP - Ra.

8. Discuss the use of NPP by humans.

9. Discuss the following statement: "In a double CO₂ world, all plants will grow faster, thereby increasing net primary production."