0610 BIOLOGY Essays (1277 words) - Secondary Education In England

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2007 question paper 0610 BIOLOGY 0610/02 Paper 2 (Core Theory), maximum raw mark 80 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. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the May/June 2007 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. Page 2 Mark Scheme Syllabus Paper IGCSE May/June 2007 0610 02 UCLES 2007 1 (a) (i) leaf B has parallel veins/veins not branched; [1] (ii) organism D has body divided into segments/rings/OWTTE; [1] (iii) organism E has four pairs of/eight legs/limbs ; I - ref to cephalothorax (erroneous) [1] (iv) organism G has more than 4 pairs of legs/limbs/non-identical/varied legs/limbs/2 regions to body/cephalothorax and abdomen; I refs to exoskeleton [1] N.B. No letter given no mark (b) show division of 50/5; (magnification) x10/times 10; R 10mm If no working then 2 marks for correct magnification If wrong working can gain 1 mark for correct magnification I ratios [2] [Total: 6] 2 (a) A = sepal/calyx; B = anther/stamen; Accept androecium [2] (b) to receive/trap pollen/OWTTE; Accept ref to male gamete [1] (c) 1 no nectary (in wind pollinated flower); 2 smaller/less obvious petals (in wind pollinated flower); 3 stamens outside of petals/flowers (in wind pollinated flower); 4 stigma/style outside of petals/flowers (in wind pollinated flower); 5 feathery stigma (in wind pollinated flower); any two 1 mark each [2] (d) process flowering plant human fertilisation germination implantation pollination sexual intercourse Each vertical column correct 1 mark each [2] I crosses in other boxes Page 3 Mark Scheme Syllabus Paper IGCSE May/June 2007 0610 02 UCLES 2007 (e) (i) 1 dispersed by animals/mammals/birds/named examples; R insects 2 red outer coat attracts them; 3 flesh encourages them to eat fruit; 4 seeds hard coats allow it to avoid digestion/discourage swallowing; 5 dispersal in faeces/dropped while removing flesh; any three 1 mark each [3] (ii) 1 moisture/water/OWTTE; 2 with minerals/named mineral; 3 warm conditions/suitable/optimum temperature; 4 in light/not shaded area; any three 1 mark each [3] [Total: 13] 3 (a) continuous (variation); [1] (b) (i) plotted as four bars, all clearly identified (beneath or on bar); accurate plotting (+/ half a square); [2] (ii) genes/alleles/genotype/DNA/OWTTE; [1] (c) (i) a change/alteration in a gene/allele/DNA/chromosome/chromosome number; [1] (ii) chemical/named example/cigarette tar; (gamma/beta/alpha/ionising) radiation; X rays; UV light; any two 1 mark each [2] [Total: 7] Page 4 Mark Scheme Syllabus Paper IGCSE May/June 2007 0610 02 UCLES 2007 4 (a) (i) F; [1] (ii) E; [1] (iii) no tropical forest left/all destroyed; [1] (iv) D; [1] (b) (i) bacteria/fungi; [1] (ii) carbon dioxide; minerals/named mineral salt/ion; I nutrients R nitrogen (gas) [2] (c) 1 crops take/use mineral salts from soil; 2 crop removed from land; 3 soil becomes infertile/low in mineral salts; 4 crop yield drops to worthless levels; 5 no fresh/replacement of humus/no recycling of materials; 6 crumb structure lost; any three 1 mark each [3] [Total: 10] 5 (a) (i) carbon compounds in animals; [1] (ii) C; D; E; any two 1 mark each [2] (iii) B; [1] (iv) A; [1] (b) (i) arrow labelled P parallel to C but in opposite direction/ linking boxes from air to plants around outside of diagram; [1] (ii) carbon dioxide + water; = glucose/(simple) sugar/starch + oxygen; [2] I ref to water on product side A correct formula as substitute for word no need for equation to be balanced [Total: 8] Page 5 Mark Scheme Syllabus Paper IGCSE May/June 2007 0610 02 UCLES 2007 6 (a) A; D; E; [3] I named parts (b) root hair cell 1 long extension/description to cell; 2 increase surface area (for absorption); 3 no chloroplasts/chlorophyll; 4 underground/hidden from light; [4] I - ref to photosynthesis