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ANS P3 - CAMBRIDGE INTERNATIONAL EXAMINATIONS JUNE 2002 GCE...

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Unformatted text preview: CAMBRIDGE INTERNATIONAL EXAMINATIONS JUNE 2002 GCE Advanced Subsidiary Level MAXIMUM MARK : 25 SYLLABUSICOMPONENT :9700 I3 BIOLOGY (PRACTICAL (AS)) -" I; UNIVERSI‘I‘qu CAMBRIDGE "I: 55" Local Examinations Syndicatfl Mark Scheme | Syllabus Paper ‘ AS Level Examinations —June 2002 | 9700 3 “I Expected Answers Additional Guidance 1 ai Any four from: + 8: - readings: All five averages in come: relative order ie W2 W4 W5 W1 W3 'tongest to shortest; Units in mm in all cells of left column; a cut 5 mean lengths calculated correctly; 3 out Of 5 mean change in lengths correct. W4 to lefl of W2 } W5 to left of W4 } max 3 marks W1 to left of W5 } we to left of Wt } -1 mart: for each error {mania} Any three from: Axis correct orientation; scale and labels correct; Plotting correct: Line of best fit is straight line close to plots. Correct reading from graph 3. units correct Water entering equals water teaving i no net MOVBIT‘IGM. Any three from: Ensure widths of strips are all same 1' SA; Use bigger range of solutions (between 0-1 unless all + then allow >1}; Larger number of strips! repeat expt'. Temperature control; Even drying with paper towel; All strips from same potato; Leave > 2D min; Leave for same time; Increase length of each strip; Cover Petri dish; Weigh. Quality of diagram is 3 concentric elipses. Outer only can be broken. No cellsr shading or stiples. Allow fat line. ignore blood coraents: 2 layers of comparable thickness; well width : overall width 1:4 — 1:3 Tunica media l elastic. labelled; Tunica adventia r‘ connective. labelled; Diameter of aorta 1 — 5 mm divided into diagram size; Calculation correct; Four from Wall is thick; To withstand pressure: Wall crinkled l elastic tissue in well; To stretch it recoil Inner lining crinkled; } Based on candidates results. 1 Allow extrapolation . OWTTE Allow fat label Accept cm if used for both. Accept written explanation of method. Bold answer allowed if within parameters. Accept prevents bursting OWTTE ...
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