1. Decomposition (biology only)


  • Students should be able to explain how temperature, water and availability of oxygen affect the rate of decay of biological material.
  1. Students should be able to:
    • calculate rate changes in the decay of biological material
    • translate information between numerical and graphical form
    • plot and draw appropriate graphs selecting appropriate scales for the axes.
    • Gardeners and farmers try to provide optimum conditions for rapid decay of waste biological material. The compost produced is used as a natural fertiliser for growing garden plants or crops.
    • Anaerobic decay produces methane gas. Biogas generators can be used to produce methane gas as a fuel.

Use ratios, fractions and percentages,

Translate information between graphical and numeric form,

Plot two variables from experimental or other data