HKDSE Biology & CombinedScience (Biology)

Report onAssessment

Ben Tsui

Manager (Biology), HKEAA

20 & 29 Nov 2013

1

Time

2:002:30

2:302:55

2:553:20

3:203:35

3:354:00

4:004:25

4:244:50

4:505:15

Content

ExamStatistics

PerformanceinPaper1Panel1

PerformanceinPaper1Panel2

Break

PerformanceinPaper1Panel3

PerformanceinPaper2 (A&C)

PerformanceinPaper2 (B&D)

Q&A

Speaker

MrTsuiChiShing

MrChanPatChun(20)

MrTsuiChiShing (29)

MrLiPingFai(20)

MrWongYukHing (29)

MrTongLan San

MrSinWai Hung

MrLeungHoWah (20)

MrChenYauHip(29)

Overview

Paper Biology CS(Bio)

1A(MC) Mean:20outof35

(i.e.58%) Mean:12outof24

(i.e.50%)

1(Mixed) ~50% ~43%

2 ~50% N.A.

SBA ~71% ~69%

Subject ~54% ~48%

Candidature 17913 4435 3

Marking & Grading

Onscreen marking (OSM) panels

Biology CS(Bio)

1B1:Q.1,2,4,8

1B2:Q.3,7,9

1B3:Q.5,6,10

1B1:Q.1,3,6

1B2:Q.2,5

1B3:Q.4,7

2A:Human Physiology

2B:AppliedEcology

2C:Microorganisms &Humans

2D:Biotechnology

SBA marks stat. moderated with both Mean and SDadjusted (outlining cases reviewed by Supervisors) 4

Marking & Grading

Expert Panel (Examiners, 5 ~ 6 persons) determine level

boundaries/cut scores by making reference to

Level descriptors

Group Ability Indicator (GAI)

Viewing candidate samples

CS(Bio) graded by common items and viewing candidate

samples

Endorsement by Senior Management/Exam Board

5

Results

Biology

Level

Percentage

5**

1.6%

5*+

6.6%

5+

16.7%

4+

43.1%

3+

70.7%

2+

89.6%

1+

97.1%

CS(Bio)

Level

Percentage

5**

0.9%

5*+

3.5%

5+

8.7%

4+

27.8%

3+

57.7%

2+

83.5%

1+

95.3%

6

12VS13 Numberofcandidatesattoplevels

Level 2012 2013

DSE5** 275 287

DSE5* 1049 1182

DSE5 2682 2992

Paper 1A

Biology (36 MC)

%of cand.correct >70% 50%70% 70% 50%70%

30%choseB,theydidnotawarethattheliningoftheairsacisaonecellthicklayertoallowdiffusionofgases,whichisapassiveprocessandhence,theamountofmitochondriaisrelativelylow

34%choseB,theytreatedenzymesasmoleculesfoundincytoplasm,infact,thereareenzymesthatarelocatedonthemembrane,forinstance,somedigestiveenzymesarefoundonthemembraneofthesmallintestineratherthaninfreeforms

33%thoughtcrossXallowsthededuction,butthereisnotenoughprooffromthiscross

41%thoughtthatmonosaccharideswasthekey,theydidnotawarethattheabsorptionofmonosaccharidesismainlydonebyactivetransport.

69%choseB(i.e.Q)asthekey,theydidnotawarethathavingalowerpressuremeansthatairisstillcominginfromatmosphere

38%choseC,theymixedupantibioticswithantibodies

Structure3isthespermduct

34%choseA,theythoughtthatthemalewouldfailtoejaculateafterthespermducthasbeentiedupandcut

Paper1B Biology(%mark)

>60% 60%40% 60% 60%40%

Paper2 Markequatingwasappliedtothe4questionsinpaper2usingperformanceinpaper1asareference

Afterequating:

Elective Popularity Comparewithpapermean

HumanPhysiology 95% >0.8%

AppliedEcology 62%

Performance:BioVSCS(Bio) Commonitems Performance

Bio CS(Bio) BiovsCS(Bio)

1 1 >8%

3 2 >10%

4 3 >4%

6 4 >3%

7 5 >4%

8 6 >3%

10 7 >10%

CorrelationbetweenwrittenexamandSBA

ExamYear Paper1 Paper2

2012 0.64 0.60

2013 0.73 0.64

MorequestionsrelatedtoSIin2013ExamP1B:

Photomicrograph:Q.3,Q.4,Q6

Experimentsetupsanddesigns:Q.6,Q.7

Graphplottingandsamplingmethod:Q.8

SubjectCommitteeagreedtokeepthelevelofdifficultyandthetypesofquestionscomparableto2013exam

2014Exam

ExamDate:4/4/2014

Markingperiod:13/4/201410/5/2014

MarkersMeeting:12/4/2014AM(Tentative)

OSMTraining:14/4/2014PM(Tentative)

Easterpublicholidays:1821/4/2014

ReleaseofResults:14/7/2014(Tentative)

Remarking:20/7/201431/7/2014(Tentative)

THANK YOU

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