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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
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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