Contents
Part 2 of 3
Gas exchange in light and dark
identify
Try it yourself
Hydrogencarbonate indicator changes colour with the carbon dioxide dissolved in it. Match each colour to what it shows.
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Scope and sources
Cambridge IGCSE Biology 0610 · 2026–2028 v3 · Original learning materials.
The effects of light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis, investigated with pondweed (6.1.8); gas exchange of an aquatic plant in light and dark with hydrogencarbonate indicator (6.1.9); limiting factors in different conditions (Supplement 6.1.11); the large, thin leaf (6.2.1); the structures of a dicotyledonous leaf in diagrams and images (6.2.2) and how they adapt it for photosynthesis (6.2.3). Bubble counts and indicator colours in the experiment come from a teaching model.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus