2.3 Flows of Energy and Matter

Energy, initially provided by the sun, and matter are transferred and transformed through ecosystems. The amount of matter or energy assimilated by organisms is referred to as productivity.

The carbon and nitrogen cycles are examples of nutrient flow through an ecosystem.


1Energy flow through an ecosystem
3The carbon cycle
4The nitrogen cycle

Chapter Workbook
Vocabulary Sheet

  • Construct a quantitative model (using spreadsheet software) of the transfer of energy or matter through a given system.
  • Measure the productivity in an aquatic ecosystem using the bottle method.

Full PSOW here.

Essay Task
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“Evaluate the diagram as a model for the carbon cycle.” [9 marks]

View essay markbands

The essay should marked using the Paper 2, Section B essay markbands.

PDF Version

Google Docs Version

Google Docs 2.3 essay

Open the link and make a copy to your own drive. The doc can easily be shared as an “Assignment” on Google Classroom.

A markbands rubric designed for Google Classroom is available here.