MARK SCHEME for the October/November 2011 question paper for the guidance of teachers 0610 BIOLOGY ... Microsoft Word - 0610_w11_ms_63.doc Author: liv...
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MARK SCHEME for the October/November 2011 question paper for the guidance of teachers
0610 BIOLOGY 0610/63
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 October/November 2011 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
Page 2
Question 1
Mark Scheme: Teachers’ version IGCSE – October/November 2011
Mark scheme
(a) (i) 7.0 to 9.8; (ii) 11.6 [11.67] to 12.6;
Mark allocation
Guidance NB 0.6 cm exists below zero.
[1]
Mark on table. Follow from (a) (i) ecf from (a) (i). Ignore reaction time as given in the question.
Max[1]
(c) (i) left hand right hand
Paper 63
[1]
(b) (i) to find out which hand gives the faster response / quicker / better reflexes; to find out if the person is naturally right or left handed / dominant hand; accurate reference to this reflex pathway; AVP; (ii) (same) ruler / ruler of same type, weight, thickness; (same) time of day or specified; ruler falls straight down / OWTTE / dropped not thrust; (same) environmental conditions e.g. humidity, temperature, no wind; quiet surroundings – ‘no distractions’ / no eating or drinking; seated or standing throughout / arm or body / hand position; (same) gap between ruler and thumb / thumb position / thumb at 0 cm; same student / use student 1 only or student 2; AVP;
Syllabus 0610
e.g. impulse along sensory neurone to brain / CNS to motor neurone Accept reaction time + comment about both hands Ignore right v left unqualified – insufficient Accept ruler in same units of cm / mm Ignore height from which ruler is dropped Ignore same place unless qualified, but accept same environment Accept distance of hand from ruler Ignore addition of stimulant e.g. alertness of catcher / catcher is unaware of when drop will be made
Max[3]
0.18 (sec); 0.15 / 0.16 (sec); [2]
Tolerance ± 0.01 s. ecf from 1(a) (ii) if incorrect units e.g. cm – Max 1 if many decimal places given – ignore and check 2dp
Mark Scheme: Teachers’ version IGCSE – October/November 2011 Mark scheme
(ii) student was right handed / right dominant / uses RH more; shorter / better / faster reaction time for right hand ORA; suggest figure 0.03 sec faster (ecf) / speed of nerve impulses faster ORA; reaction time decrease with practice; (d)
Mark allocation
Max[2]
Paper 63 Guidance
Accept right hand is master hand Accept ref to right hemisphere of brain being dominant / producing quicker co-ordination Ignore just 2 figures quoted Ignore reaction time differs without qualification Ignore the use of stimulant as a medicine Ignore irrelevant similarities
two sets of data – one with stimulant and one without; more than one student or group of students involved; same or similar age / gender / fitness / arm length; time for drug to take effect; repeats; set amount of stimulant; taken set period before test; controlled (same) conditions e.g. time of day; safety factor; idea of comparing 2 results; reference to use of a control qualified;
Syllabus 0610
Accept even if referral is to trial with stimulant only ‘cup of tea’ is acceptable. e.g. no wind / no distractions. Ignore “fair test” Safety in the environment or with dose size / quantity / medical conditions / no injections Max[3]
Ignore ‘control’ alone. If different investigation – max 1
Mark Scheme: Teachers’ version IGCSE – October/November 2011 Mark scheme
Syllabus 0610
Mark allocation
Paper 63 Guidance
e.c.f histogram and line on same axes – B. max 4
(ii)
minimum label for ‘x’ axis – ‘number of fruitlets’ alone / ‘fruitlets in each fruit’ and numbers should be placed centrally under columns. Tally size incorrect e.g. 50–60 instead of 50–59 …. no L mark. Accept last column as 100–109
O – orientation of axes; L – label ‘x’ number of fruitlets in fruits and ‘y’ frequency / tally / number of fruits; S – suitable even scale to fill half or more than ½ the grid in both directions; P – plot accuracy;
P – accept ± ½ small square. ecf from tally chart
B – neat, ruled and complete bars of equal width, touching, no gaps;
Ignore shading. Columns should be ruled (to base) [5]
(c)
normal distribution / unimodal / bell-shaped; more in the middle of range / biggest class is 70–79 / 60–89; few at the extremes / example / AW; Max[2]
(d)
animals or named example; eat / ingest / consume fruits; seeds unharmed not digested / resistant; deposit with faeces / egested / excreted / AW;
Line graph O; L and S only Ignore continuous as this applies to variation Accept most fruits have 70–79 / 70–79 is the most common (min is “70 – 79 fruitlets is higher”) Accept “ends of graph declining” Accept ref to graph or fruitlets Accept bites / chews / eats fruit and spits seed out / we eat
Mark Scheme: Teachers’ version IGCSE – October/November 2011 Mark scheme
(a) (i) stem – central ring to include minimum of 4 distinct vascular bundles; vascular bundle divided correctly into two for x and p; xylem on inside labelled and phloem on outside labelled; (ii) root –
central vascular strand; (xylem) central – star like and (phloem) in between; xylem and phloem correctly labelled;
(b) (i) sucrose; (ii) starch;
Syllabus 0610
Mark allocation
Paper 63 Guidance
Draw and label Ignore LS instead of TS [3]
Accept minimum label ‘x and p’ Ignore LS instead of TS
[3] [1]
Ignore cane-sugar
[1]
Ignore glycogen
(c) Cut a section / crush different regions and test each one; add iodine solution; turns brown / yellow / orange to blue / blue – black / black / purple-black in areas where starch is present; Max[2]
Ignore – if glucose given in 3(b) (ii) and Benedict’s test given = 0 crush / grind alone = 0 Accept iodine in potassium iodide / drops of iodine / iodine is dripped on Ignore iodide solution Ignore if add ethanol or boil