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Stoma density and water lossFeatured science projectScience project video


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.

Evapo-transpiration is the total loss of water from the surface of the earth into the atmosphere. It consists of the water evaporating from the soil and water bodies and also the transpiration of water that occurs in plants. These processes are part of the water cycle.

Also consider

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.

The experiment can also be repeated by calculating the surface area of the leaves and comparing the difference in results.


Plant transpiration -

Stoma -

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 5 days for the science project experiment
Material availability:
Plants may be purchased at a plant nursery.
Safety concerns:

Basic safety requirements