Project cost ($):
1 hour to prepare, 5 days for the science project experiment
Plants may be purchased at a plant nursery.
Basic safety requirements
Table of Contents
This science fair project was conducted to compare the relationship between stoma density and loss of water through transpiration. The experiment was performed with large leaves from the elephant ear plant, the money plant (medium size leaves) and ivy (small leaves).
Plants with big leaves have more stomata and lose more water through transpiration.
Transpiration, stomata, stoma, photosynthesis, hydrostatic pressure
- The graph below represents the results of our science project experiment:4 large beakers
1. For this science project, the independent variable is the type of plant used – the ivy (Hedera), money plant (Epipremnum aureum) and elephant ear plant (a member of the Caladium family). The dependent variable is the amount of water lost from the beaker through evaporation and transpiration. This is determined by using the measuring cylinder to measure the water after 5 days. The constants (control variables) are the size of the plants, the size of the beaker, the amount of water in the beaker, the room temperature, wind in the room and the amount of sunlight received by the plants.
It was observed that there was no significant difference in the amount of water lost from each the beakers that contained the 3 types different of plants respectively.
The chart below represents the results of our science project experiment:
The hypothesis that plants with big leaves have more stomata and lose more water through transpiration is proven to be false. All plants had almost the same rate of water loss over the 5 days. The small ivy plant had more leaves and the big elephant ear plant had less leaves. Therefore the total number of stomata might have been similar.
Try to repeat the experiment using more varieties of plants, or by using just 1 plant variety (eg. elephant ear plant) but varying the number of leaves.
Plant transpiration - http://www.juliantrubin.com/encyclopedia/botany/transpiration.html