T3W6 [USS] S4 BIO PRELIMS 2023 P1 P2 MS

S4E BIOLOGY USS Prelim Exam 2023 Mark Scheme P1 P2 Page 1 of 7 UNITY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2023 Secondary 4 (Express) Biology 6093 General notes Symbols used in mark scheme and notes. 1. ; separates points for the award of a mark 2. / separates alternatives for a marking point 3. R reject 4. A accept (for answers correctly cued by the question) 5. Ig ignore/irrelevant (for incorrect but irrelevant responses) 6. AW alternative wording (where responses vary more than usual) 7. AVP alternative valid point (where greater than usual variety of responses is expected) 8. ORA or reverse argument/reasoning 9. OWTTE or words to that effect 10. ( ) contents in brackets are not required to gain marks but should be implied 11. underlined words – actual word underlined must be used by students 12. + statements on both sides of the ‘+’ are needed for that mark 13. MP mark point (numbered marking points to facilitate teaching and feedback for students) Biology 6093/01 Multiple Choice Qn C3R Ans Qn C3R Ans Qn C3R Ans Qn C3R Ans 1. KU B D 11. KU B B 21. HISP B D 31. KU B A 2. KU C B 12. KU B C 22. HISP B B 32. KU B C 3. KU C A 13. HISP B A 23. HISP B C 33. HISP A D 4. KU B C 14. KU B A 24. KU B B 34. KU B A 5. KU B D 15. KU B B 25. HISP A C 35. KU B B 6. KU B C 16. HISP B D 26. HISP A D 36. KU B A 7. KU B D 17. HISP B C 27. HISP B D 37. KU B C 8. KU C D 18. KU B A 28. KU B C 38. KU B B 9. KU B B 19. HISP B C 29. HISP B C 39. KU B C 10. KU B B 20. KU B A 30. KU B B 40. KU B C

S4E BIOLOGY USS Prelim Exam 2023 Mark Scheme P1 P2 Page 2 of 7 Biology 6093/02 – Structured and Free Response Questions Question C3R Answer Part Marks Marker’s Annotations 1a HISP A MP1. species B lost more water than species A in, either/ both, conditions/ ORA; MP2. both species lost more water in hot conditions than in cool/ ORA; MP3. the difference in water loss (in cool and hot temperature) was greater in species A compared to B/ ORA; MP4. ref data, comparison/ quote + units, for, cool/ hot; max 3 Comparison qn – expected to use ‘comparison words’ and ref species + temp Different ways of saying the same point will not get additional marks MP4 - Repeated reference to data without comparison max 1m 1b HISP A MP1. one bar drawn on Fig. 1.1, with a height less than 4.8 cm3 per hour (i.e. lower than Species B, cool temp bar); MP2. correct spacing of 2 units + same width with existing bars (cool temp) 1 1 1c KU C xylem; 1 Total: 6 2a HISP B B: cilia + (beat dust-trapped) mucus upwards/ out of the airway; C: mucus + traps particles/ pathogens; E: cartilage/ c-shaped ring + keeps the airway/ trachea open; max 3 AVP - B/C prevent infections; 2bi KU B U → P; → T → S → Q → R; V 2 2bii KU B MP1. For gas exchange/ diffusion / movement of CO2 and O2 ; MP2. short distance (for diffusion/ gas exchange); MP3. fast/ efficient (gas exchange / diffusion); max 2 Total: 7 3a HISP B ki