AES_2019_Bio_Prelim_ANS

1 ASSUMPTION ENGLISH SCHOOL Sec 4 Biology 6093 Marking Scheme Preliminary Examination 2019 Paper 1 (40 m) Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 D C B A B C D C A B Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 B B C D B C A D C A Q21 Q22 Q23 Q24 Q25 Q26 Q27 Q28 Q29 Q30 A C D C B B B C C B Q31 Q32 Q33 Q34 Q35 Q36 Q37 Q38 Q39 Q40 C B C B B B A D C D Paper 2 Section A (50 m) a P – protein/polypeptide Q- glycerol R – fat/lipid S – glucose/monosaccharide every 2 correct – 1 m 2 b i Benedict’s test 1 b ii Add an equal volumeof Benedict’s solution into the sample; Shake the mixture and place the test tube into a boiling water bath for 3 minutes; If glucose is present, a brick-red precipitate will be formed; 3 points – 2 marks, 2 points – 1 mark, 0 to 1 point – no marks 2 2 a phloem 1 b J and K; K is a leaf which takes in radioactive carbon dioxide for photosynthesis; The radioactive sugars formed in leaf K (through photosynthesis) can be translocated / transported up to J; Radioactive sugars cannot move down to the roots M or leaf L as the phloem at X is removed; 4 c All parts/ J, K, L and M; The phosphorus will be present in the roots M as water is absor bed by the root / plant roots absorbed radioactive phosphate ions; The radioactive phosphate ions can be transport up the xylem to the J, K and L as it remains intact; 3 3 a O: phagocyte/white blood cell P: capillary 1 1 andddddddd K;K;K;K;K;K; s a lllllllleaf whi radi C Q37 Q333333888888 B A A A AA A D DDDDD C polypeptptpttptptpttptptptptpttttptptptptptptptptpttptptttptppppppppppppppppppppppppppp idiiiddiddidididdiddiddddididdidiidiiidididdddddddddddddde e eeeeeeeeeeeeeeeeeeeeeeeeeeeee QQQQQQQQQQQQQQQQQQQQQQQQ --------------- glycerererererererererereerrrerrrrrrrrrrrrrrrrololoolololololololooolloloolollllllllllllllll pid SSSSSSSSSSSSSSSSSSS ––––––––––––– glggggggggggggggggggggggggg uccccccccccccccccccccccccosososososososososososososososossoosossooosssoosoososooososssososososooossossossssse/monosacccccccccccchahahahahaharide every y yyyyyyyyyyyyyyyyyyyyyyyy 2 corrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr ecececeeececececeecececececececeeececeeceeceececececececeeceeeeeceeeceeeececccecececececcececececect t t t t –––––––––––––––––––––– 1 m b i BeBeeeBeeeeeeeeeeBeeeeBeBeeeBeeBeBeeeBBeeeBBeBeeeneneeeeeeeeeeeeeeeeedidididididididididididididictc ’ s tetetetetetetetetetettetetetettetetetttttettettetttttttttttttttt ssssstsssssssssssssssssssssssssssssssssssss b iiiiiiiiiiiiiiiiiiiiiiiiiiii AdAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA d annnnnnnnnnnnnnnnnn eqeqeqeqeqeqeqeqeqeqeqeqeqequauaaaaaaaaaaaaaaaaaaaaaaaaaaaaaall volumemememememememememeemmememmmemmmemmmmmmmmmmeee ofoffoffofofofofoffofffoffofofffoofoofofofofffofoooofofofofofofofofooofofofofooofofofoooffffffo BBBBBBBBBBBBBBBBBBBBBBBBBBBBBeneneeneneneneneneneneneeneneneneneenenenenneneenneenenneneenneeeenenenneneeennnenee edededededededeeededdededdeededeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee icicccccccccccccccct’t’t’t’t’t’t’t