Broadrick 2019 Bio Prelim ANS

2 6093/2 [Turn over] Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2019 BIOLOGY Paper 2 Theory Candidates answer on the Question Paper No Additional Materials are required. 6093/02 Sep 2019 1 hour 45 minutes ANSWERS Section A (50 marks) Answer all the questions in the space provided. Paper 1(mcq) 1. C 6. C 11. B 16. C 21. D 26. B 31. B 36. D 2. C 7. D 12. B 17. D 22. D 27. A 32. B 37. C 3. C 8. D 13. C 18. B 23. B 28. B 33. D 38. D 4. D 9. C 14. D 19. A 24. D 29. C 34. A 39. A 5. C 10. D 15. A 20. A 25. D 30. D 35. C 40. D 1( a ) Translocation is the transport of food, such as sugars and amino acids (1m), synthesised by plants Food is transported from leaves to all parts of the plant, in the phloem tubes. ( 1m) [2] 1 hhhohohohh ur Secttttttioioioioioioioioioioioiooioooioiooioioiooioiiiiii nnnnnnnnnnnnnn A ( 50505050550500005050505505000500 mamaaaaaaaaaaaaaaaaaaaaaaaaarkrkrkkkrkkkkrkrkrkkkrkkkkrkkkkkrkkrkrkrkrkkkrkrkkrkkkkrkrkrkkkrkrkkrkrkrkrkrkkkrkrkrkkkrkkrkkkrkkkkkkkkkkkkkkkkkkkkkkkkkkrkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkksssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss ) ) ) ) )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) A nswer allllllllllllllllllllllllllll ththtththththtthththttthtttthtthththtththttthtthtttthttthhhhhhhhhhhhee quququuuququuuuququququuuuuuuquuququququuququuquuqqququqqqqquqqqqqqquqq eseseseeseeeeeseeeseseeseseseeseeeeeeseseeseeseseseseeseeesessssssssssssssstititititititititititititititititititiononononononnononnnononnononnononnnnonnonnnnnnonnnonnnnonnnnnno s s ssssssssssssssssss ininnnninnnnninnininninnnnnnnnnnnninnninnnnnnnnnnnnnnninnii tttttttttttttttttttttttttttttttttttthehhhhhhhhhhhhhhhhhhhhhhhhhhhh space pppppproooooovvvvviv ded. C 6.6.666.66666.6.666.6666666666666666666666666666666 C 1111111111111111111111111111111111111 . B 1616161616661661616161616666166666666666616616161666666666616666.. CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 222222221222222222222222222222222 . DDDDDD 26 C 7.7.7..7...7................ DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD 1111121 .. BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB 171771717171717177171771717717717771777171711777771717771717177177177111 . DDDDDD 2222222 . D 8. DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD 13131313131313131333131313331331313333313133313313331313313133133131313111113131331111 ......................... C 181818181818. B CCCCCCCCCCCCCCCCCCCCCCCCCC 1444444. DDDDD 1 DDDDD 15 www.KiasuExamPaper.com 186

3 6093/2 [Turn over] (bi) Xylem [1] (ii) 1. lack of cross walls - allows continuous flow of water and mineral salts 2. empty with no cytoplasm - allows continuous flow of water and mineral salts 3. lignin deposited on inner walls of xylem walls - provides mechanical support /strengthens wall to prevent collapse award one mark for each feature plus its adaptation. (max 2 points) [2] (c) -weedkiller dissolves in water found in soil solution. -T h e ro o t h a i r c e l l s o f t h e p l a n t a b s o rb w a te r a n d th e d i s s o l v ed weedkiller by osmosis and diffusion respectively. -Water and dissolved weedkiller move into xylem vessels in the r oots down a concentration gradient. -Xylem vessels transport water and weedkiller to all parts of p lant, including leaf. -In the leaf cells, weedkiller move from cell to cell by diffus ion and exerts its effect. Plant stops photosynthesising. (maximum 4 points) [4] [Total:9m] 2( a ) The energy needed to start a chemical reaction [1] bi In boiling tube 1, pH 2 is the optimum pH for protease to digest protease. (1m) This releases silver particles into suspension.(1m) In boiling tubes 2 and 3,protease denatured at higher temperatures, pH 7 and pH 10,Protease does not digest gelatine (type of protein) (1m) [3] (c) Carbon dioxide produced by respiration diffuses into the blood. Carbonic anhydrase in red blood cells catalyse reaction between carbon dioxide and water to form carbonic acid.(1m) The carbonic acid dissociates to form hydrogencarbonate ions which diffuse out of red blood cells into plasma.(1m) In the lungs , hydrogencarbonate ions diffuse back into red blood cells.(1m) They are converted to carbon dioxide and water by carbonic anhydrase.(1m) Carbon dioxide produced diffuses into alveoli and is excreted.(1m) [4] Max 3 points. 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