Featured in PASCO’s College Biology Instructor Guide
College Instructor edition with 26 experiments covering introductory and general biology topics.
Use a barometer to explore the effects of environmental factors, such as air movement, on the rate of transpiration in a plant.
Students observe the rate of transpiration in a plant and then test the effects of various environmental factors on that rate. Students also observe the differences between monocot and dicot stems and relate their structure to their functions.
- Students measure the effects of wind, light, and humidity on transpiration rate.
- Students relate the properties of water to water transport in plants.
- Students study the organization of the xylem in a plant stem as it relates to its function.
Students gain experience conducting the following procedures:
- Setting up a potometer and a barometer sensor to measure the rate of transpiration in a plant.
- Measuring the rate of transpiration under different environmental factors (wind, light, and humidity).
- Calculating the surface area of the leaves used in the transpiration experiment.
- Observing prepared slides of monocot and dicot stems.
Sensors / Equipment Used:
Measures atmospheric pressure changes and doubles as a low pressure sensor. For use with PASPORT Interfaces.
Allows an additional two meter length extension on all PASPORT sensors.
100-watt light source
Compound light microscope
Dicot stem prepared slide
Electronic Balance - 1 per class
Glycerin - A few drops
Heat sink (large beaker or aquarium filled with water)
Knife or single-edge razor blade
Large Base and Support Rod
Monocot stem prepared slide
Petroleum jelly - 2 to 3 g
Plant seedlings, 12-25 cm tall
Spray bottle with water
Transparent plastic bag
Wide, shallow bowl or tub filled with water
The Associated Bundle:
A complete probeware bundle designed for PASCO's College Biology curriculum