Explain why the student added glucose solution to each Petri dish

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Explain why the student added glucose solution to each Petri dish.
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
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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