Biology · Oct / Nov 2020 · Paper 62 · Question 2
0610
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The question as text
Fig. 2.1 is a photomicrograph showing several cells from an Elodea sp. aquatic plant. A Fig. 2.1
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2(a)(i)[4]
single clear outline and no shading ;
cell at least 10 cm from left to right ;
details:
two clusters of chloroplasts (minimum of three in left cluster and four in right cluster) ;
two ‘protrusions’ in cell wall at cell junctions top and bottom ;
2(a)(ii)[3]
(length of PQ) = 94 ± 1 (mm) ;
0.078 / 0.08 mm ;;
2(b)(i)[1]
103 (bubbles per minute) ;
2(b)(ii)[4]
axes labelled with units ;
even scale and with plots using at least half the grid in one direction ;
six points plotted accurately + half a small square ; suitable line drawn ;
2(b)(iii)[1]
43 ± 1 (bubbles per minute) ;
2(b)(iv)[2]
as plant moves further away from the light: ora
number of bubbles remains constant and then decreases ; change in rate, after 100–139 cm / after the first two readings (either distance or bubbles) / after the first three readings / AW ;
2(b)(v)[1]
idea of plant equilibrating to the new conditions / AW ;
2(b)(vi)[3]
39 (%) ;;;
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