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Biology · Oct / Nov 2021 · Paper 41 · Question 1

0610

As printed in the paper

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  • 1(a)(i)[1]

    reptiles and amphibians ;

  • 1(a)(ii)[3]

    one mark per row:

    feature

    fish

    mammals

    birds organ involved in gas

    gills

    lungs

    lungs

    exchange

    circulatory system

    single

    double

    double

    body covering

    scales

    fur

    feathers

    presence of external ears

    no

    yes

    no

    (pinnae)

  • 1(b)(i)[2]

    (net) movement of particles, from a region of their higher concentration to a region of their lower concentration / down a concentration gradient ;

    as a result of their random movement ;

  • 1(b)(ii)[1]

    any one from:

    large surface (area) / AW ;

    thin ;

  • 1(c)(i)[1]

    nitrate (ions) / sewage / fertilisers / AVP ;

  • 1(c)(ii)[3]

    15 °C – 8.9 ± 0.1 (mg per dm3) and 25 °C – 7.3 ± 0.1 (mg per dm3) ; 2.35 ± 0.05 (µm) and 1.95 ± 0.05 (µm) ;

    (–)0.4 (in µm) ;

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