TwoOldGuys Study Guides
BI-114 BioConcepts for Teachers
Appendix B. Laboratory Exercises
L-4. Lab Exercise 4
How Plants Move Nutrients from Soil to Leaves (& other parts)
intended for grade K (to 4)
- Question: Do materials travel up the plant stem?
- Hypothesis: materials are carried up the stem by the plant,
I think I saw this on a television science show.
- alternate hypothesis: materials don't travel up the stem.
- State what observable event is expected to occur because the hypothesis is true;
food coloring added to the water in a vase with flowers will move up the stem
and dye the flower.
Materials and Methods
Written just like a recipe, in sufficient detail that anyone should be able to
duplicate your experiment.
- Materials: what supplies are needed (be specific), and how much of each.
- 2 or more flowers
- 2 vases
- food coloring
- Methods: what do you do with the supplies?
- fill vases about 1/2 full of water
- add enough food coloring to make the water a bright color
- cut bottom end of stem at an angle
- quickly transfer half of the flowers into each vase
- experimental design:
- experimental group where conditions are met:
vase with food coloring
- control group where conditions are not met:
vase without food coloring
- 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."
[optional] you may discuss how this changes our concept of how the Universe works?
This section could also stand alone as a formal essay as can the introduction.
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