A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea stems, the students marked a 10mm length of stem on each of four plants and applied growth substances to the stem. Figure 2 shows a graph of the student's results. Length of stem section (mm) 161 14- 12- 10- 0 10 20 30 Time (h) a) Describe the effects on growth of the stem for the 2 growth substances applied separately. (4) 40 IAA and GA IAA GA control 50 60

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea
stems, the students marked a 10mm length of stem on each of four plants and applied growth
substances to the stem. Figure 2 shows a graph of the student's results.
16-
14-
12-
10
10
20
40
IAA and GA
'IAA
GA
control
30
Time (h)
a) Describe the effects on growth of the stem for the 2 growth substances applied separately. (4)
50
60
Transcribed Image Text:A student investigated the effect of plant growth substances (IAA and GA) on the elongation of pea stems, the students marked a 10mm length of stem on each of four plants and applied growth substances to the stem. Figure 2 shows a graph of the student's results. 16- 14- 12- 10 10 20 40 IAA and GA 'IAA GA control 30 Time (h) a) Describe the effects on growth of the stem for the 2 growth substances applied separately. (4) 50 60
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