Q22 · 2021 · Paper 1Unclassified3 marks
QUESTION 22 (3 marks)
Describe two ways carbon is transformed and one way it is transferred as it cycles through the biotic components of an ecosystem.
WORKED SOLUTION
3 marksQCAA guide · typeset solution
QCAA sample response and mark allocation
22 | Atmospheric carbon exists mainly as carbon dioxide, which is transformed from carbon dioxide gas to produce glucose (and other complex organic molecules) via photosynthesis. This also covers the transfer from atmosphere to plants by diffusion. Respiration transforms glucose into carbon dioxide. | • states 1 transformation [1 mark] • states another transformation [1 mark] • states 1 transfer [1 mark] |
QCAA sample response and marking criteria reproduced from the official guide.
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