ABSTRACT
The stomata are necessary for photosynthesis to occur. When open, they allow carbon dioxide to diffuse from the air into the leaf and for oxygen, a waste product of photosynthesis, to diffuse from the leaf into the air. This chapter describes the procedure for identifying and counting the number of stomata present on different leaves. This real-world science experiment is structured as a problem-solving activity thus helping KS3 science teachers to engage students effectively in the secondary school classroom. First, background science knowledge for this experiment is provided, along with the learning objectives, list of materials needed for the experiment, safety and technical notes, and a list of engaging activities to be performed by students. Data collection ideas are subsequently provided, together with useful questions to ask the students and also suggestions for homework.
