Plants & Human Affairs (BIOL106) - Stephen G. Saupe, Ph.D.; Biology Department, College of St. Benedict/St. John's University, Collegeville, MN 56321; ssaupe@csbsju.edu; http://www.employees.csbsju.edu/ssaupe |
SEEDS
II Experiment
Objectives: Upon completion of this
lab, you should be able to:
describe the growth of a tomato plant
design
and conduct a scientific experiment
analyze
and report the results of a scientific experiment
Introduction:
The purpose of this laboratory is to study the effect that
microgravity and increased pressure has on the germination and subsequent growth
and development of tomato seeds. The variety of tomato used in this experiment
is California Rutgers Supreme. These
tomatoes are open-pollinated (self-pollinated by the wind) and give good yields
of large fruit. The average number
of days from seed to mature fruit is 74.
The seeds were provided as a joint project sponsored
by the Park Seed Company (Greenwood, South Carolina) and NASA Life Sciences
Outreach Program. Park Seed donated
4.2 million tomato seeds for the
SEEDS II project. The seeds were
first tumbled in a drum to remove the seed fuzz.
This reduced the volume and lessened the possibility of contamination of
the seeds. The seeds were then
divided into three equal groups. One
set was kept at Park seed facilities as the control seeds.
Another set was sealed in a Get-Away Special Canister and flown aboard
space shuttle Atlantis as part of the payload for the STS-86 mission and the
third set was sealed in a dry container and placed in the Scott Carpenter Space
Analog Station that was deployed underwater in Key Largo, Florida.
After nine days all seeds were returned to Park Seed Company where they
were packaged in foil packets (SEEDS II brochure).
Table 1 provides a comparison of the treatments of the three groups of
seeds.
Table
1. Comparison of Treatments
in the SEEDS II Experiment |
|||
|
Control |
Space |
Underwater |
Facility |
Park
Seed Company |
Space
Shuttle Atlantis |
Scott
Carpenter Analog Station |
Location
|
Greenwood,
SC |
Earth
orbit (184 statute miles) |
30
feet undersea, Key Largo, FL |
Storage
Container |
Dry
Canister |
Get
Away Special Canister (GAS Can) |
Dry
Canister |
Temperature
(C) |
21 |
16
- 18 |
23
� 28 |
Humidity
(%) |
20 |
0 |
80
- 99 |
Pressure
(atmosphere) |
1.0 |
0 |
1.6 |
In this lab, we will study some
aspect of tomato growth. In small
groups we will brainstorm potential research questions.
After sharing these ideas, we will select one or more questions to study
in greater detail.
Procedures
We will begin by
working in small groups. Each group
will brainstorm as many testable questions as possible.
We will than share these ideas with the class.
As a group we will select one or more questions to study with our
experiment. We will generate
hypotheses from our questions and then develop an experiment to test our
experiments. For each question, we
will use and complete the following model:
Question: (there are many potential
questions; we will select one or a limited number)
Hypothesis: (State it as a null hypothesis. What are some alternative hypotheses)
Predictions: (identify the predictions from your hypothesis)
Protocol: (briefly outline the methods
that we will use in our experiment. Include
an indication of what we will measure, etc.)
Results (what data did you collect?)
Conclusions: (what do our data show? use appropriate statistical tests to analyze our data)
Assignment:
For each of the questions that we generate and
decide to test, turn in a separate sheet addressing each of the six major
points. Then write a summary of the entire experiment. One
page. Include in your summary information about the effect of microgravity
on plants.
References:
SEEDS
II Packets. 1999.
NASA/Park Seed Co.
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