Biology · May / June 2025 · Paper 62 · Question 2

thermostatically controlled water-bath / AVP ;

any two from:

mass of apple ;

volume of, pectinase / enzyme (solution) ;

time / left for 30 minutes ;

axes labelled with units ;

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

all points plotted accurately ± half a small square ;

suitable line drawn ;

any indication on graph at 0.5% pectinase concentration / indication of correct value on the volume axis ;

correct value recorded from candidates graph ;

increasing, concentration / pectinase , increases juice production and then stops increasing / AW ;

more concentrations measured between 0.4% and 1.6% ;

drawings of:

funnel with filter paper ;

measuring cylinder ;

labelling:

at least one item correctly labelled ;