An animated description of the process of photosynthesis. Carbon dioxide seeps into leaves through pores called stomata. It reaches the chloroplasts where chlorophyll uses energy from sunlight to bind the carbon dioxide with water brought up from the roots to form carbohydrates. Oxygen is produced as a by-product.

This clip is from:
Bitesize: Biology
First broadcast:
26 October 2007

Students can complete several practical activities to reinforce the material shown. A table lamp can be moved closer to a beaker containing pondweed and the bubbles of gas counted to see the relationship between light intensity and photosynthesis. Half of a leaf can be covered for several days and then the leaf tested for starch using iodine (after boiling) to prove that photosynthesis only occurs in the light. Students could make model plant cells using boxes to show their structure and explain the function of cell components.