O-LevelBiologyEcology & Environment5090/21 · May/June 2022 · Q57 Marks
A plant species lives in ponds. The diagrams show the whole plant and a section through one of its leaves. plant leaves float on surface of water pond water soil section through leaf A B
- (a)(i)Suggest one advantage to the plant of the leaves floating on the surface of water.[1]
- (a)(ii)Name the parts of the leaf labelled A and B. A B[2]
- (a)(iii)With reference to parts A and B, describe and explain how the structure of the leaf is adapted to a pond environment.[3]
- (b)The plant is part of a food web in a pond. State its trophic level.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] light /carbon dioxide from air + for photosynthesis OR more AW + light / carbon dioxide;
- [1] A = stoma;
- [1] B = air/ intercellular + space ;
- [3] any three from: stomata + on upper surface AW ; gaseous exchange / air enters / air leaves ; carbon dioxide + for photosynthesis ; large + air spaces; air space + leaf buoyancy / float / less dense ;
- [1] producer / first trophic level ;
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →