Vernier Software and Technology
Vernier Software & Technology

Interdependence of Plants and Animals


Plants and animals share many of the same chemicals throughout their lives. In most ecosystems, O2, CO2, water, food and nutrients are exchanged between plants and animals. In this lab, you will be designing your own experiments to determine the relationships between two organisms—a plant (Elodea) and an animal (a snail).

Several hypotheses have been discussed in the past about possible relationships between the Elodea and the snail. You will test to determine how oxygen and CO2 are exchanged among Elodea plants, snails, and the water both exist in.

To perform the necessary tests, you will need to determine the presence of CO2. An easy way to do this is to monitor the pH of the pond water. If CO2 dissolves in water, it forms carbonic acid, H2CO3, and the pH decreases. If CO2 is removed from pond water, the amount of carbonic acid goes down and the pH increases. One can use a computer to monitor the pH and determine whether CO2 is released into the pond water or is taken from the water. Dissolved oxygen (DO) can be monitored with the aid of a Dissolved Oxygen Probe. Increases or decreases in the amount of dissolved oxygen can be rapidly assessed with this probe.


In this experiment, you will

  • Use a Dissolved Oxygen Probe to measure the dissolved oxygen in water.
  • Use a pH Sensor to measure the pH of water.
  • Use pH measurements to make inferences about the amount of CO2 dissolved in water.
  • Determine whether snails consume or produce oxygen and CO2 in water.
  • Determine whether plants consume or produce oxygen and CO2 in the light.
  • Determine whether plants consume or produce oxygen and CO2 in the dark.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Agricultural Science with Vernier »

Agricultural Science with Vernier

See other experiments from the lab book.

1Introduction to Data Collection
2Acids and Bases
3Diffusion through Membranes
4Conducting Solutions
6Respiration of Sugars by Yeast
7Reflection and Absorption of Light
8Soil pH
9Soil Salinity
10Soil Temperature
11Soil Moisture
12APhotosynthesis and Respiration (CO2)
12BPhotosynthesis and Respiration (O2)
12CPhotosynthesis and Respiration (CO2 and O2)
14ACell Respiration (CO2)
14BCell Respiration (O2)
14CCell Respiration (CO2 and O2)
15The Greenhouse Effect
16Energy in Food
17AEnzyme Action: Testing Catalase Activity
17BEnzyme Action: Testing Catalase Activity
18ALactase Action
18BLactase Action
19Oxygen Gas and Human Respiration
20Biochemical Oxygen Demand
21Animal Temperature
22Lemon "Juice"
23Ohm's Law
24Energy Content of Fuels
25Photovoltaic Cells
26Wind Power
27Watershed Testing
28Interdependence of Plants and Animals
29Biodiversity and Ecosystems

Experiment 28 from Agricultural Science with Vernier Lab Book

<em>Agricultural Science with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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