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Photosynthesis Oxygen Production Experiment

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Photosynthesis Oxygen Production Experiment

Investigate how light affects oxygen production in an aquatic plant. Read the procedure and sample data, then answer each question. Work with an adult if you carry out the experiment: use a lamp only as directed, keep electrical equipment away from water, and do not taste or drink anything.

Plan the experiment

Procedure: Put equal-sized pieces of the same aquatic plant in two beakers containing equal amounts of water. Keep one in light and cover the other so it is dark. Allow both plants to adjust for 5 minutes. Count bubbles released in 1 minute, then repeat for three trials. Keep the plant size, water volume, temperature, and counting time the same.

1.Predict which plant will release more bubbles per minute: the plant in light or the plant in darkness. Explain your prediction using what you know about photosynthesis.

2.In this investigation, what is the independent variable—the factor deliberately changed?

The light condition
The number of bubbles counted
The length of each counting trial
The amount of water in the beaker

3.Which factor should be kept the same in both setups to make the comparison fair?

The plant size
Whether the plant receives light
The bubble count
The result of each trial

4.Fill in the missing reactants and product: carbon dioxide + water + energy → glucose + .

5.The bubbles rising from the plant are evidence of which substance being released?

Oxygen
Glucose
Chlorophyll
Carbon dioxide

Analyze sample results

A student collected this sample data using the procedure above. Bubble counts are bubbles per minute.

Condition

Trial 1

Trial 2

Trial 3

Light

Dark

6.Use the three light-condition counts in the table. What was the average number of bubbles per minute? Show or describe your calculation.

7.Which condition had the higher average bubble count, and what does that suggest about light and photosynthesis?

8.The dark-condition counts were 2, 1, and 3 bubbles per minute, rather than zero. Give one reasonable explanation for why bubbles might still appear in darkness.

9.How does chlorophyll help a plant carry out photosynthesis?

10.Give one reason photosynthesis is important to organisms other than plants.

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7th Grade

Photosynthesis Oxygen Production Experiment

Photosynthesis Oxygen Production Experiment

Plan the experiment

Analyze sample results

2 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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