TwoOldGuys Study Guides
BI-114 BioConcepts for Teachers
Appendix B. Laboratory Exercises
L-3. Lab Exercise 3
Seed Germination 2
As I peeled the beans for experiment 2, several beans broke apart. I wondered if the broken
seeds would germinate and grow enough to emerge as seedlings, and for that matter, how small
a part of a seed could survive to become a seedling. I thought that half a seed might
survive, but less than that I fully expected to die. This experiment seemed to be more
interesting than the first formal science experiment I ever designed, so I designed my second
formal science experiment, without waiting to see the results of my first experiment.
intended for grade 5 (to 8)
- Will part of a seed grow?
- I really don't think that this will work.
I suspect that it takes a whole seed to survive, although maybe half a seed can
- (no entry)
- If the hypothesis is true, then the parts of seeds will not emerge as seedlings.
The whole seeds will emerge as seedlings.
Materials and Methods
Written just like a recipe, in sufficient detail that anyone should be able to
duplicate your experiment.
- 60 seeds (dried red beans)
- 12 styrofoam coffee cups
- enough black dirt to fill the cups
- Methods: what do you do with the supplies?
- fill cups with soil up to 3/4 inch below rim
- carefully separate the halves of 15 seeds (1/2 of a seed),
separate 15 seeds and cut the half with embryo attached in two (1/4 of a seed),
separate 15 seeds and cut the half with embryo attached in two twice (1/8 of a seed),
and leave the remaining 15 whole
- mark 3 cups "1/2" and place 5 half-seeds in each
mark 3 cups "1/4" and place 5 quarter-seeds in each
mark 3 cups "1/8" and place 5 eighth-seeds in each
mark 3 cups "whole" and place 5 whole seeds in each
- add 1/2 inch soil on top of seeds
- write "day zero. planted seeds." in notebook
- water daily to keep soil moist to the touch
and write "day 1,2,3..." and how many seedlings are up in notebook
- experimental design:
- experimental group where conditions are met: partial seeds
- control group where conditions are not met: whole seeds
- Record what actually happened,
and not what you think should have happened.
Depending on the age of your students, this may include descriptions, drawings,
numbers and graphs, ...
- based on data presented:
- "The hypothesis has been proven to be true."
- "The hypothesis has been proven to be false."
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