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.
|1||Respiration and photosynthesis|
|2||Food chains, food webs and feeding relationships|
|4||Productivity pyramids and limitations to food chain length|
|5||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.