Featured in PASCO’s Biology through Inquiry Teacher Guide

Biology through Inquiry Teacher Guide

(PS-2870C)

Features 25 inquiry based labs covering the fundamental concepts of cell biology, ecology and physiology.

Transpiration

Lab Summary

Use a barometer/low pressure sensor to explore the effects of environmental factors such as air movement on the rate of transpiration.

Theory

In this exploration, students use a barometer as a potometer to measure the rate of water uptake in plants due to transpiration.

  • This activity demonstrates the concept of "transpiration pull".
  • Students explore the effects of environmental factors, such as air movement, on the rate of transpiration.

Method

Students use a barometer/low pressure sensor to measure the change in pressure in a tube connecting the sensor to the stem of a plant as the plant undergoes transpiration in still air and then in moving air.

  • Students use the analysis tools of the data collection system to determine the change in pressure per unit of time for each condition.
  • Students compare the changes in pressure per unit of time (rate of transpiration) for each condition and propose reasons for the changes.

Sensors / Equipment Used:

PASPORT Barometer/Low Pressure Sensor

(PS-2113A)

Measures atmospheric pressure changes and doubles as a low pressure sensor. For use with PASPORT Interfaces.

PASPORT Sensor Extension Cable

(PS-2500)

Allows an additional two meter length extension on all PASPORT sensors.

Base and Support Rod

(ME-9355)

The Large Base and Support Rod includes built-in leveling screws and an aluminum rod that is 12.7 mm (1/2 in.) in diameter and 45 cm long.

Three-Finger Clamp

(SE-9445)

Clamp tubes, rods, and irregularly shaped objects.

Buret Clamp

(SE-9446)

The V-shaped, plastic-coated jaws will gently hold a buret and lock at any angle.

Materials Used:

Pipet

Knife

Fan

Bowl

Glycerin, 1 mL

Petroleum jelly, 2 to 3 g

Plant seedling, 12 to 15 cm tall

Water, 1 L

Your Bundle Options:

Option 1:

Biology Starter Sensor Bundle

(PS-2920)

A sensor bundle specifically designed to get you started using probeware in your biology lab. Also: perform 10 of the 24 Lab Activities from Biology with Inquiry.

Option 2:

Biology Standard Sensor Bundle

(PS-2925A)

The Biology Standard Sensor Bundle includes a photosynthesis tank and the sensors required to perform 19 of the 24 Lab Activities in the Biology through Inquiry manual.

Interface Required

This experiment may require software and an interface for data collection.