Biology · Oct / Nov 2023 · Paper 62 · Question 3

outline – single clear line no shading ;

size – frond length at least 114 mm ;

detail 1: 7 bladders drawn ;

detail 2: central midrib shown as a double line at least up to the point at which the midrib branches ;

line PQ = 12 ± 1 mm ;

0.63 ;;

any two from:

bladder wrack has more bladders ;

bladders are closer together ;

bladder wrack, has bladders in pairs / either side of mid rib, or egg wrack has single bladders ;

bladder wrack has a central mid rib ;

bladder wrack, divides into two at the end / more branched ; bladder wrack is, wider / thicker / AW, (all the way along) ; bladder wrack is, lighter / brighter, (in colour) ;

bladder wrack (fronds) are all in the same direction ; bladder wrack has smaller bladders ;

bladder wrack has rounded ends / smoother ;

AVP ;

any two from:

temperature ;

wind(speed) ;

humidity ;

species / type, of seaweed ;

age of seaweed ;

size / length / surface area ;

idea of how long the bladder wrack has been out of the water ;

measuring time / interval time (between measuring mass) / sampling times ;

spacing while hung up ;

amount of blotting / blotting time / blotting method / type of blotting paper ;

a result that does not fit the pattern / trend / AW ;

did not include sample 2 in the calculation / AW ;

57 (%) ;;

axes labelled with units ;

suitable size with a linear scale and data that occupies at least half of the grid in both directions ;

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

biuret ;

DCPIP ;