Contents
Independent final check
Explain without the key
describe
Final check
Describe how you would investigate the effect of light intensity on the rate of photosynthesis of pondweed. (a) Describe the method. (b) Describe how you would keep (i) the temperature and (ii) the carbon dioxide concentration the same.
describe: give the features or what happens.
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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