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Botanist Timothy Walker examines the cellular structure of the underside of a leaf. He explains how tiny pores in the epidermis, called stomata, regulate the amount of carbon dioxide able to enter the plant.
This clip is from:
First broadcast:
14 June 2011

Classroom Ideas

The clip could be shown to help students develop an understanding of photosynthesis beyond basic detail. Students could use microscopes to study the leaves of various species and relate their physical characteristics to the conditions they grow in. This can be used as an introduction to leaf structure and then developed into a discussion of the other features of a leaf and how it is adapted for efficient photosynthesis.