IGCSE Biology / Plants and food
Practical: the effect of light on net gas exchange in a leaf revision notes
Edexcel International GCSE Biology (4BI1), chapter 10: Plants and food, specification point 2.45B. Part of the full course.
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Hydrogencarbonate indicator shows whether carbon dioxide around a leaf increases, decreases or stays unchanged. Comparing leaves in different light levels reveals the net effect of photosynthesis and respiration.