Featured in PASCO’s College Biology Instructor Guide

College Biology Instructor Guide

(PS-3800A)

College Instructor edition with 26 experiments covering introductory and general biology topics.

Elodea and Snail

Lab Summary

Use a water quality sensor to measure pH changes in a series of simulated closed systems containing various organisms.

Theory

In this activity, students investigate the interrelationships that exist between photosynthetic and aerobic organisms. Students explore: 

  • The processes of cellular respiration and photosynthesis.
  • The interdependence of respiration and photosynthesis.
  • How oxygen molecules cycle through respiration and photosynthesis.

Method

Students gain experience conducting the following procedures:

  • Modeling environmental changes using an aquatic snail and an aquatic plant.
  • Using the pH probe to measure pH changes in a series of simulated closed systems containing various organisms.

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.

Materials Used:

Aquatic snails - 2
Bromothymol blue solution (in dropper bottle) - 500 mL
De-chlorinated water - 500 mL
Drinking straw 
Elodea sprigs (or other aquatic plant) - 2 to 4
Labeling marker 
Labeling tape 
Large test tubes - 4
Standard Buffer (pH 10) - 25 mL
Standard Buffers (pH 4) - 25 mL
Test tube rack 
Test tube stoppers - 4

The Associated Bundle:

College Biology Bundle

(PS-2926B)

A complete probeware bundle designed for PASCO's College Biology curriculum

Interface Required

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