The presenters use graphs to explain how light, carbon dioxide and temperature affect the rate of photosynthesis. The difference between the graphs for temperature, and light and carbon dioxide are explained. Denaturing of enzymes is mentioned.

First broadcast:
21 November 2008

Students should use this clip to explain the three limiting factors of photosynthesis. After watching the clip, students could be asked to explain them in their own words, drawing graphs as appropriate.