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Biology · May / June 2024 · Paper 61 · Question 3

0610

As printed in the paper

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  • 3(a)(i)[4]

    outline that is a single clear outer line ;

    size is at least the width of the image ;

    detail 1: six seeds shown and two openings without seeds ; detail 2: indents in external shape at the top and on both sides ;

  • 3(a)(ii)[3]

    line PQ = 104 ±1 mm ;

    47.3 (mm) ;;

  • 3(b)(i)[2]

    starch: iodine solution ;

    protein: biuret solution ;

  • 3(b)(ii)[2]

    add ethanol and (then) water ;

    shake ;

  • 3(c)(i)[1]

    volume of, juice / (filtered) liquid / filtrate ;

  • 3(c)(ii)[2]

    any two from:

    volume of pectinase / 50 cm3 of pectinase
    incubation time / time in water(-bath) / 30 minutes in water(-bath)
    temperature / 37 ⁰C
    type of, fruit / juice

    ;;

  • 3(c)(iii)[2]

    hazard: enzyme / pectinase ;

    precaution: goggles / gloves ;

    OR

    hazard: cutting / chopping (apple) ;

    precaution: cut away from body / cut onto a hard surface ;

  • 3(c)(iv)[1]

    to identify anomalous results ;

  • 3(c)(v)[1]

    the same volume of, water / boiled pectinase / denatured pectinase ;

  • 3(d)(i)[2]

    138 ;

    cm3 ;

  • 3(d)(ii)[4]

    axes labelled with units ;

    suitable linear scale and data occupies at least half the grid in both directions ;

    six points plotted accurately ± half a small square ; suitable line drawn ;

  • 3(d)(iii)[2]

    as concentration increases, volume increases ;

    levels off / AW, at 0.8 (%) OR no further increase after 0.8(%) ;

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