MARK SCHEME for the May/June 2011 question paper for the ... Cambridge is publishing the mark schemes for the May/June 2011 question papers ... 0610_s...
MARK SCHEME for the October/November 2011 question paper for the guidance of teachers 0610 BIOLOGY ... Microsoft Word - 0610_w11_ms_63.doc Author: livich
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
for the guidance of teachers
0610 BIOLOGY 0610/61
Paper 6 (Alternative to Practical), maximum raw mark 40
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes must be read in conjunction with the question papers and the report on the examination.
• Cambridge will not enter into discussions or correspondence in connection with these mark schemes.
Cambridge is publishing the mark schemes for the May/June 2011 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
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MARK SCHEME for the May/June 2011 question paper
s er
International General Certificate of Secondary Education
Page 2
Question 1
Mark Scheme: Teachers’ version IGCSE – May/June 2011 Mark scheme
(a)
Blue / blue black / black;
(b)
(Change in colour ) to white / yellow / paler blue / paler blue black / paler black;
(c)
(i) (ii)
72; 78;
Mark
Guidance / comments Ignore purple / mauve / brown
[1]
Accept grey / colourless / brown / yellow orange / blue black weakened Ignore reference to ‘’change in colour’’ only / black colour disappears / bleach
[2]
Correct answers = 2 Mark independently If both incorrect allow 1 mark for correct working
[5]
O ‘x’ axis – time in mins and ‘y’ axis – number of new areas or total areas ( where there had been a reaction) If total number plotted (wrong curve) = max 4 do not award A S plots to fill at least ½ the grid in both dimensions P accept +/- 0.5 mm (½ a small square). L points joined by ruled lines point to point or a smooth curve Do not allow extrapolation or double/thick lines
O – Orientation;
S – Scale; P – Plots; L – Line;
Two marks from: age difference / gender difference / different types of goat / genetic difference / health of goat / concentration of enzyme (in saliva) / diet / hunger level / AVP;;
Paper 61
[1]
A – Axes labels;
(iii)
Syllabus 0610
Ignore references to pH and temperature Ignore references to paper starch levels MAX [2]
Mark Scheme: Teachers’ version IGCSE – May/June 2011
Syllabus 0610
Paper 61
Three marks from: 1. longer final time period; 2.
more frequent readings;
3.
do a control or description of boil and cool the saliva or use water;
4.
One control variable ( paper, pH, temperature, saliva amount, same volume of sample, type of goat etc);
5.
repeats or replicates;
6.
calculate mean / average;
7.
more precise timing device;
8.
AVP;
MAX [3] [Total: 14]
2
(a)
4 drawing marks
Drawing: O Clear lines and no shading; S Larger than photograph; D Hairs drawn precisely; P Seed area drawn with regard to shape; Labels: attachment / position of seed / hairs; [5]
Hairs to be attached to the top end of fruit – not matted Hairs shown as straight, single lines Ignore ornamentation on seed. Ignore incorrect labels Accept alternative wording for hairs Ignore words which describe other biological features
Mark Scheme: Teachers’ version IGCSE – May/June 2011
Length of fruit in Fig. 2.1 in mm / cm 73 +/– 2 mm / 7.3 +/– 0.2 cm; Length of fruit in drawing in mm / cm (+/– 2 mm or +/– 0.2 cm);
Syllabus 0610
Paper 61
penalise once for incorrect / absent units [2]
Correct magnification and X;;
Accept error carried forward from (b)(i) Accept correct answer for 2 marks even if no working shown Accept X before or after magnification / “times” [2]
If answer incorrect allow max 1 for correct working e.g. length of drawing / length of image – in words or figures
Mark Scheme: Teachers’ version IGCSE – May/June 2011
(i) feature Hairs / parachute / pappus / AW; (ii)
Dry fruit [Fig. 2.2] Wide spread / AW AND
Syllabus 0610
Paper 61
One mark for identifying feature wherever in table Error carried forward for feature from label in 2a
Damp fruit [Fig. 2.3]
2nd mark for description
Closed / close / AW; [2]
Five marks from: dispersal: 1. dry / windy – seeds blown away; 2. increase of surface area / bigger to ‘catch’ the wind / breeze / air currents in the dry; 3. wet – drop to the ground / are not dispersed; 4. to spread away from parent plant / to new place / habitat; 5. avoids competition with parent plant / each other / avoids overcrowding / more space; germination: 6. wet / damp soil / place / humid; 7. enzyme activation / working / respiration ORA; 8. warmer; 9. AVP;
Ignore pollen / spores dispersed by wind
4. must be linked to dispersal not just germinating in new habitat
Mark Scheme: Teachers’ version IGCSE – May/June 2011
Possession of outer layer / skin / rind / bark / have layers / ‘roundish’ shape / cortex; Three differences from: difference ginger stem shape irregular / oval / random / AW none / cavities / holes / gaps / pores / compact pipes / air spaces inner layer fibrous / fibres / hair like dark / thick outer layer / / rough bark / skin / wall colour more uniform AW;
Syllabus 0610
Paper 61
Ignore references to cells / colour [1] Accept comparative answers in one box only If answers are in one box only, they must be comparative Ignore references to phloem and xylem
