An ecology student investigates the factors influencing the distribution and abundance of plant species in a coastal sand dune ecosystem.
Which row in the table below correctly classifies one abiotic factor and one biotic factor measured during this ecological study?
| Abiotic factor | Biotic factor | |
|---|---|---|
| A | Pathogen prevalence | Soil salinity |
| B | Grazing intensity | Wind velocity |
| C | Soil nitrate concentration | Interspecific competition |
| D | Water temperature | Rainfall volume |
Row A
Row B
Row C
Row D
67 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.