Biology · May / June 2022 · Paper 61 · Question 2
0610
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The question as text
Fig. 2.1 is a photomicrograph of a section through part of a marram grass leaf, Ammophila arenaria. Fig. 2.1
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2(a)(i)[4]
outline - single clear unbroken line ;
size - greater than 90 mm diagonally (top left to bottom right) ;
detail 1: (at least) four projections ;
detail 2: either four vascular bundles shown OR presence of hairs on at least two projections ;
2(a)(ii)[3]
measuring line PQ = 112 (mm) ±1 (mm) ;
0.9 (mm) ;;
2(b)(i)[2]
independent variable: concentration of sodium chloride solution ;
dependent variable: length of roots ;
2(b)(ii)[2]
any two from:
(four) repeats ;
large number / AW / 15, seeds (grown at each sodium chloride concentration) ; measured, at same time / (after) 20 days (of growth) ;
same species / all marram grass seeds / AW ;
2(c)(i)[3]
31.6(%) ;;;
2(c)(ii)[4]
axes labelled with units ;
suitable even scale and plotting area occupies at least half the grid in both directions ;
six points plotted accurately ± half a small square ;
suitable line drawn ;
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