Food chains, food webs and ecological pyramids are models to show feeding relationships in ecosystems. Interactions between organisms and their environment results in transfers and transformations of energy and matter.
|Respiration and photosynthesis
|Food chains, food webs and feeding relationships
|Productivity pyramids and limitations to food chain length
|Bioaccumulation and biomagnification
“DDT can accumulate through the food chain in increasing concentrations as a consequence of biomagnification. Compare the attitudes that an ecocentrist and an anthropocentrist may have on the use of DDT.” [9 marks]
The essay should marked using the Paper 2, Section B essay markbands.