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Biology · Oct / Nov 2024 · Paper 61 · Question 2

0610

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In plants, water moves up the stem in xylem vessels as a column of water molecules as a result of transpiration. A celery stalk that still has its leaves attached can be used to investigate the movement of water in a plant, as shown in Fig. 2.1. Fig. 2.2 shows dye in the xylem vessels of a celery stalk. not to scale Fig. 2.1 Fig. 2.2 9 Plan an investigation to determine the effect of temperature on the rate of movement of a coloured dye through celery stalks. [6]

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independent variable:

1

at least two different temperatures ;

dependent variable:

2

time for dye to reach the leaves or a set distance

or

distance moved by dye in a set time

or

number of cut sections containing dye ;

3 and 4 detail of method – max two from ;;

method of maintaining (at least one) air temperature
idea of slicing the end off the celery before immersion
cutting sections (with a, knife / scalpel)

5, 6 and 7 variables kept constant - max three from ;;;

wind-speed
humidity
light intensity
length / height / size, of, celery / stalk
number of leaves / surface area of leaves
species / type / age, of, celery
(named) colour / concentration / volume, of dye
time (in dye) / time stated
thickness of cut sections / sections cut in the same plane / AW 8

two or more replicates at each temperature

/ repeat the investigation at least two more times ;

9

suitable safety precaution ;

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