Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Question
Explain why the student added glucose solution to each Petri dish.
Transcribed Image Text:A student investigated the effects of indoleacetic acid (IAA) on the growth of
oat seedlings (young plants).
The student:
• removed the shoot tip from each seedling and cut out a 10 mm length of shoot
• placed 10 lengths of shoot into each of 5 Petri dishes
• added to each Petri dish an identical volume of 5% glucose solution
• added to each Petri dish 40 cm of a different concentration of IAA solution
• left the Petri dishes at 20 °C in the dark with their lids on for 5 days
• removed the shoots after 5 days and measured them
• determined the mean change in length of shoot at each concentration of IAA.
Table 1 shows her results.
Table 1
IAA concentration
added to Petri dish
10 5
10
3
10
1
1
10
/ parts per million
Mean change in length
of shoot / mm
0.0
0.1
1.3
2.4
3.1
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