The purpose of this paper is to describe the experiment, which illustrates the process of photosynthesis. Teaching about processes of photosynthesis is one of the most difficult science themes, because of its complexity and abstract nature. Students often have difficulties understanding the processes of photosynthesis, mostly because of incorrect conceptualization and inappropriate simplification of the processes. For successful teaching of photosynthesis teachers are suggested to implement practical work. We designed an experiment to detect oxygen and carbon dioxide levels change during day-night cycle of photosynthesis in the chamber with a plant. In conclusion, implications for teaching science in primary school using the described experiment were discussed.
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