Section C Answer either question 8 or question 9. Write your answers in the spaces provided. (a) Describe how a plant takes in carbon dioxide from the air and mineral ions from the soil.

Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

1. [1] carbon dioxide: diffusion;
2. [1] down concentration gradient AW ;
3. [1] through stomata ;
4. [1] into air spaces (in leaf);
5. [1] mineral ions: root hair;
6. [1] through + cell wall ;
7. [1] through + cell membrane ;
8. [1] active transport ;
9. [1] against concentration gradient AW ;
10. [1] reference to use of energy ;
11. [1] magnesium / nitrates ;
12. [1] dissolve / solution ;
13. [1] in water;
14. [1] xylem;
15. [1] reference to transpiration ;
16. [1] into palisade mesophyll ;
17. [1] into chloroplast ;