A sycamore tree is a producer for many food chains in a forest ecosystem.

Mark scheme

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

1. [1] photosynthesis / autotrophic / making own organic nutrients;
2. [1] flow / transfer + energy / food ;
3. [1] (for biomass) tree has large mass so long rectangle / correct reference to relative masses at two trophic levels;
4. [1] (for biomass) biomass declines as trophic level increases ;
5. [1] (for numbers) there is only one tree so a short rectangle for numbers / correct reference to relative numbers at two trophic levels;
6. [1] after producer both pyramids in shape;
7. [1] energy is lost (to the environment) ;
8. [1] as heat / thermal energy ;
9. [1] from respiration;
10. [1] large / colourful + petals / sepals ;
11. [1] nectaries / nectar;
12. [1] scent;
13. [1] anthers / stigma + inside petals / short / sticky stigma;
14. [1] markings / nectar guides / petals modified with insect landing site ;
15. [1] pollen rough / sticky;
16. [1] meiosis;