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Biology · May / June 2024 · Paper 62 · Question 2

0610

As printed in the paper

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  • 2(a)(i)[4]

    single clear unbroken outline ;

    size greater than half of space provided ;

    detail 1: proportions plumule vs radical ;

    detail 2: two outermost curved leaves ;

  • 2(a)(ii)[3]

    31 ±1(mm) ;

    (×) 3.4 ;;

  • 2(a)(iii)[3]

    one similarity from:

    root / radicle / AW, present
    (any) structure, pointing / AW, downwards
    seed coat / seed covering / testa / AW, present / split
    side roots / root hairs, present
    two differences from:

    P

    Q

    marks on / darker,

    OR

    no marks on / paler, seed coat / AW

    seed coat / AW shoot / plumule /

    OR

    no, shoot / plumule / stem / stalk

    stem / stalk

    (root is) not,

    OR

    (root is)

    hairy / furry / fibrous

    hairy / furry / fibrous / feathery / branched

    / feathery / more branched

    thick (side) roots / AW

    OR

    thin (side)

    roots / AW

    has leaves

    OR

    has no leaves oval, seed / AW

    OR

    round, seed / AW larger / longer

    OR

    smaller / shorter ;;

  • 2(b)[3]

    starch: iodine solution ;

    reducing sugar:

    Benedict’s solution ;

    heat ;

  • 2(c)[6]

    any six from:

    1

    independent variable: use at least two different light intensities ;

    2, 3 and 4 variables kept constant ;;;

    max three from:

    age of plant
    type / species, of plant
    (starting) surface area / number of leaves / size / height
    temperature
    wind speed / humidity
    light, wavelength / colour
    soil type / AW / fertiliser / soil minerals / soil pH
    volume / amount, of water supplied
    time

    5 and 6 detail of method ;;

    max two from:

    method of changing the light intensity

    e.g. different lamp distances / dimmer switch altered / different bulbs / different lamps / different power lamps / different light sources

    method of measuring angle of seedling

    e.g. use a protractor / measure on a photograph / use a ruler to measure from the soil to the top of the seedling

    use of a heat shield

    7

    repeat the whole investigation at least two more times ; 8

    relevant safety point ;

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