1. What do you think would happen if the apical tip of each of these lateral shoots were now also to be cut? 2. Formulate your hunch into a null and an alternative hypothesis: a. Null Hypothesis: b. Alternative Hypothesis:

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PR Singly and in combination to regulate the
growth and development of higher plants. The effects of hormones, either stimulatory or
inhibitory, depend on the hormone concentration, the tissue affected, and the
developmental status of the tissue. This lab will focus on just three hormones: Auxin,
Ethylene, and Gibberellic Acid.
Student Preparation
Read textbook Chapter 27, pages 638-659.
LA. Apical Dominance
Indole-3-acetic acid (IAA) is the principal naturally occurring auxin. It is produced by
terminal shoot buds and commonly inhibits development of lateral, or axillary, shoot buds.
Observe the plant which was cut several weeks ago so as to remove the primary shoot
apical meristem. Note the presence of several lateral shoot buds growing from the main
stem.
This lab is adapted from:
Evert RF, Eichhorn SE, Perry JB. 2013. Laboratory Topics in Botany. 8th ed. New York: WH Freeman; 27-1 p.
101
Transcribed Image Text:PR Singly and in combination to regulate the growth and development of higher plants. The effects of hormones, either stimulatory or inhibitory, depend on the hormone concentration, the tissue affected, and the developmental status of the tissue. This lab will focus on just three hormones: Auxin, Ethylene, and Gibberellic Acid. Student Preparation Read textbook Chapter 27, pages 638-659. LA. Apical Dominance Indole-3-acetic acid (IAA) is the principal naturally occurring auxin. It is produced by terminal shoot buds and commonly inhibits development of lateral, or axillary, shoot buds. Observe the plant which was cut several weeks ago so as to remove the primary shoot apical meristem. Note the presence of several lateral shoot buds growing from the main stem. This lab is adapted from: Evert RF, Eichhorn SE, Perry JB. 2013. Laboratory Topics in Botany. 8th ed. New York: WH Freeman; 27-1 p. 101
1. What do you think would happen if the apical tip of each of these lateral shoots were
now also to be cut?
2. Formulate your hunch into a null and an alternative hypothesis:
a. Null Hypothesis:
b. Alternative Hypothesis:
Leaf Abscission
Ethylene is the only plant hormone that is a gas. As such it can easily move from one
nt to another.
Your lab instructor may recruit you to help set up the following experiment. Arrange
ngs of holly shoots into two jars filled with water. Place each under a bell jar. Under one
e bell jars, also place a piece of fruit. You may choose wheth
Transcribed Image Text:1. What do you think would happen if the apical tip of each of these lateral shoots were now also to be cut? 2. Formulate your hunch into a null and an alternative hypothesis: a. Null Hypothesis: b. Alternative Hypothesis: Leaf Abscission Ethylene is the only plant hormone that is a gas. As such it can easily move from one nt to another. Your lab instructor may recruit you to help set up the following experiment. Arrange ngs of holly shoots into two jars filled with water. Place each under a bell jar. Under one e bell jars, also place a piece of fruit. You may choose wheth
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