The main things acc. to me which are definitely gonna come are:
Reproduction - perhaps a diagram for the reproductive system and its labelling
Transpiration and other things related to it
Inheritance - perhaps a genetic cross can come, and also the relation between malaria and sickle cell anaemia
Eutrophication - graph is very important
Small intestine and villi
Homeostasis
moreover everything is very important...i have a file from cie which tells us about the relative weightages of topics in the paper...will try to post here if i find it