Gas exchange in flowering plants — Edexcel International GCSE Science (Double Award)
Carbon dioxide and oxygen as the waste products of respiration and photosynthesis in plants.
Revision notes
1 short note, in the order of the specification. Each one in short:
Metabolism is all the chemical reactions in a cell, and two of its products are waste products in a plant. Carbon dioxide is a waste product of respiration, and oxygen is a waste product of photosynthesis. Both gases leave the plant from the leaves by diffusion through the stomata.
Exam questions
1 exam-style question (3 marks), each with its mark scheme.
Answer the questionsFlashcards
1 card: flip them, mark what you knew, and practise the rest.
Practise the cardsMind map
The whole of structure and functions in living organisms on one page, so you can see where this subtopic fits.
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Quick check questions
Which gas is a waste product of photosynthesis and leaves through the stomata?
Show answer
Oxygen.
Written and checked against the Edexcel IGCSE Science Double Award (4SD0) specification · Updated October 2026