Describe the similarities and differences in structure and function of root hairs and villi.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.

1. [max. 4] structural similarities: long / elongated ;
2. [max. 4] providing large surface area ;
3. [max. 4] functional similarities: absorption / uptake ;
4. [max. 4] active transport / diffusion ;
5. [max. 4] ions / salts / minerals / named ;
6. [max. 4] water;
7. [max. 6] structural differences: cell wall / no cell wall;
8. [max. 6] (root hair) part of one cell ;
9. [max. 6] (villi) many cells / multicellular ;
10. [max. 6] ref. absence of blood vessels/lacteals / ORA ;
11. [max. 6] AVP;
12. [max. 6] functional differences: root hairs + absorb from the soil;
13. [max. 6] villi + absorb from the gut ;
14. [max. 6] villi + absorb amino acids ;
15. [max. 6] villi + absorb glucose ;
16. [max. 6] villi + absorb lipids/glycerol/fatty acids ;