O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2024 · Q381 Mark
Some students set up an experiment to study the decay of leaves in garden soil. They put leaves in bags of different mesh sizes, sealed them and then buried them. Each month for 5 months the bags were dug up and the total percentage loss in mass from the start of the experiment was calculated. The results are shown. What can the students conclude from these results? [Diagram and Table]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
ADecay is dependent on access to oxygen for the decomposers.
BThe larger the mesh size the faster the rate of decay.
CDecay depends on how much water can get to the leaves.
DNutrients diffuse away from the leaves more easily when mesh size increases.
✓ Correct answer
B: The larger the mesh size the faster the rate of decay.
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