1. BIOLOGICAL DRAWINGS FROM MICROSCOPE SLIDES A comparative analysis

2. ELODEA LEAVES showing one or more hook cells on the edge of a leaf

3. M

4. low A cell arrangement OK but: proportions are off; tip of hook cell inaccurate, chloroplasts too big for cell … overall, too stylised for a drawing

5. M

6. N proportions way off; hook cell curved on wrong side; inconsistent representation of the cell wall

7. low M angle between leaf and hook cell is a bit too wide

8. A tip of hook cell doesn’t show its main special feature i.e. thick cell wall

9. M

10. high A cells a bit wide and too rounded at ends

11. M

12. M

13. N cell shapes wrong cells don’t look like part of a leaf interlocking of cells doesn’t match slide hook tip has not been thickened! chloroplasts drawn too large

14. M

15. A cell outlines too wavy; tip of hook cell inaccurate; chloroplasts drawn carelessly (have hair!)

16. M

17. A cells too far apart; shapes don’t interlock well

18. M

19. M

20. M immediately obvious which cells have been drawn

21. A cell shapes don’t interlock enough chloroplasts too big for cells cell wall thickness too variable

22. LEAF TEARS showing a stoma and guard cells surrounded by epidermal cells

23. some shape mismatch sketchy lines chloroplasts open! A

24. M could have shown: membranes of plasmolysing cells, thick edges of guard cells around the stoma opening

25. M shapes, proportions and spacing excellent

26. A guard cells drawn far too large and cell shapes don’t match

27. N significant mismatch of shapes and sizes

28. M could have shown membranes of plasmolysing cells air bubble!

29. M obvious from shapes which cells have been drawn

30. A cell junctions misplaced shapes don’t match the specimen very well

31. specimen is clearly well understood by person drawing M

32. N epidermal cell shapes a poor match and way too small compared to guard cells; not enough cells drawn

33. M accurate, but ideally should show a couple more complete cells

34. A nuclei and shapes don’t match specimen very well

35. N mismatch of shapes and proportions; cells being “scalloped” off first cells; two cells drawn as one?

36. A guard cells way too small

37. M

38. A cells too angular guard cells too small

39. M clear match

40. A cell junctions don’t match and proportions are off

41. A cell proportions off: three need to be narrower for M

42. M clear match to specimen

43. M starts of walls of surrounding cells show that these cells are part of a larger piece of tissue

44. A guard cells drawn too elongated epidermal cell shapes do not match specimen well

45. SPIROGYRA a unicellular organism that lives in threads with other Spirogyra

46. …but why would you even try to draw something this hard? M