Examine the graph (handout) and answer the questions based on the data presented.

1. What are the 3 major factors which affect the rate of photosynthesis?






2. What happens to the rate of photosynthesis at excess CO₂ concentration as light intensity increases from about 0 to 1400 foot-candles (low light intensity)? Explain why.






3. What happens to the rate of photosynthesis at low light intensity as the concentration of CO₂ increases? Explain why.






4. Compare the bottom and middle curves at a light intensity of 1400 foot-candles. Why does the rate of photosynthesis differ?






5. Why do the middle and top curve level out (plateau) even in excess CO₂?






6. What happens to the rate of photosynthesis as the temperature is increased? Explain why.