A student puts equal masses of grass clippings into bags.
Each bag is kept at a different temperature for 10 days.
Table
| Temperature in ∘C^\circ\text{C}∘C | 10 | 20 | 30 | 40 | 60 |
|---|---|---|---|---|---|
| Mass of grass decomposed in g | 4 | 9 | 15 | 18 | 3 |
Which statement explains the result at 60 ∘C60\ ^\circ\text{C}60 ∘C?
The decomposers have too much oxygen, so they stop respiring.
The grass dries out, so the decomposers respire anaerobically.
The enzymes of the decomposers are denatured, so decay is slow.
The decomposers photosynthesise less, so they make less glucose.
111 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.