Biology · Oct / Nov 2021 · Paper 62 · Question 2

1

single clear lines for outline ;

2

uses at least half available space (70+ mm length without stalk) ;

3

detail 1 at least 6 sections, indicated with lines, on either side ; 4

detail 2 at least 3 overlapping sections or indication of ‘zig zag line’ down the centre ;

62 (mm) ± 1 mm ;

0.04 (mm) ;;

(–)53(%) ;;;

1

axes labelled with units :

wind speed / m per s AND (average) distance / m ;

2

even scale with plots occupying at least half the grid in both directions ;

3

0.0, 0.6 and 0.8 points plotted accurately for both sets of data, ± half a small square ;

4

line drawn for each data set plotted ;

5

correct key given ;

intersection with line shown on graph ;

correct reading of value from graph for 0.5 ms–1 ;

add Benedict’s (solution / reagent) ;

heat ;

red / orange / yellow / green, (colour) ;

any six from:

independent variable:

1

at least two different temperatures ;

dependent variable:

2

measure mass of leaves before and after / measuring the movement of bubble / meniscus, in capillary tube of potometer / measuring mass of pot and soil before and after / observing change in colour of (anhydrous) cobalt chloride paper ;

method:

3

method of maintaining at least one of the temperatures ; 4

description of, suspending leaves (on a line) / use of potometer / wrapping whole pot and soil in a bag ;

5

further description of how the apparatus would be set up ; 6

wait for set period of time ;

7,8 constant variables max two from: ;;

repeat the whole investigation at least two times (three trials) ; 10 safety ;

11 AVP ;

any one from:

to decrease humidity:

dehumidifier / use a desiccant / AW ;

to increase humidity:

bowls of hot water around apparatus / place in plastic bag / AW ;