Featured in PASCO’s College Environmental Science Instructor Guide

College Environmental Science Instructor Guide

(PS-3809A)

College Instructor edition with experiments covering introductory and general environmental science topics.

Photosynthesis & Productivity

Lab Summary

Use a dissolved oxygen sensor to determine the primary productivity of an aquatic plant.

Theory

Students determine the primary productivity of an aquatic plant.

Method

Students will gain experience conducting the following procedures:

  • Use a dissolved oxygen sensor to measure the rate of change in dissolved oxygen concentrations in a closed chamber while exposing an Elodea plant to bright light and in darkness.
  • Calculate the net primary productivity (NPP) rate, cellular respiration (R) rate, and gross primary productivity (GPP) rate.
  • Estimate the total GPP, R, and NPP of the Elodea plant if maintained in the experimental condition for 24 hours.

Sensors / Equipment Used:

PASPORT Water Quality Sensor

(PS-2169)

Measures temperature, conductivity, pH/ISE/ORP and dissolved oxygen. It is specifically designed for convenience in conducting water quality lab experiments. For use with PASPORT Interfaces.

EcoChamber

(ME-6667)

A single acrylic chamber designed to integrate sensors for controlled-environment experiments such as fermentation and plant or cricket respiration.

Materials Used:

Black cloth, opaque, 50 cm x 50 cm 
Dechlorinated tap water - 1 L
Elodea sp. plant - Several
Lamp, 100 W or high-intensity 
Magnetic stirrer and stir bar 
Alternative to the photosynthesis tank:
Erlenmeyer flask, 250-mL 
Large base and support rod 
Mineral oil 
Shallow pan or dish, large 
Three-finger clamp 

The Associated Bundle:

College Environmental Science Sensor Bundle

(PS-2930A)

Contains the probeware needed to perform all 26 experiments in the College Environmental Science instructor guide.

Interface Required

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