There is an explanation of the reactant and products of photosynthesis. The mention of light and chlorophyll as necessary components is also made. The differences between photosynthesis and respiration in terms of energy use are discussed.

First broadcast:
21 November 2008

Students may use this clip as an introduction to photosynthesis. To see if students understand it, you could ask them to explain the differences between photosynthesis and respiration.