A farmer is using a tool, called a mattock, to weed her crop. right arm

Mark scheme

Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.

1. [1] named bone(s) + location ;
2. [1] antagonistic muscles ;
3. [1] biceps contract ;
4. [1] become shorter / radius or ulna is moved towards humerus ;
5. [1] triceps relax;
6. [1] hinge joint;
7. [1] no leaching / run-off into water / water pollution ;
8. [1] so insecticides not ingested by aquatic insects ;
9. [1] no bioaccumulation AW ;
10. [1] (so fertilisers) don't cause algal bloom / eutrophication ;
11. [1] eutrophication detail e.g. decomposition of algae / lack of oxygen / increase in bacteria;
12. [1] pollinators / insects that eat pests can still function ;
13. [1] increase biodiversity ;
14. [1] greater variety of food sources for consumers ;
15. [1] if artificial fertilisers replaced with organic then soil structure maintained AW ;