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Photosynthesis Oxygen Production Experiment

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Photosynthesis Oxygen Production Experiment

A class is testing whether light affects oxygen production in an aquatic plant. Use the investigation setup and data below to analyze the experiment. Oxygen bubbles are a useful clue that photosynthesis is occurring. Do not taste or drink any experiment materials.

Plan the investigation

Think about what the class changes, what it measures, and what it should keep the same.

1.Which statement is the best testable prediction for this investigation?

The plant in light will produce more oxygen bubbles in four minutes than the plant in darkness.
The plant in darkness will grow taller in four minutes than the plant in light.
Both plants will use oxygen to make sunlight.
The water will turn into carbon dioxide under the lamp.

2.Identify the independent variable (the factor deliberately changed) and the dependent variable (the factor measured).

3.Name two factors the class should keep the same in both containers to make this a fair test.

Read the results

The class counted bubbles for four minutes in each of three trials. Use this data table for Questions 4–7.

Condition

Trial 1

Trial 2

Trial 3

Light

Dark

4.Calculate the mean number of bubbles for the light condition. Show or explain your calculation.

5.Calculate the mean number of bubbles for the dark condition. Show or explain your calculation.

6.How many more bubbles per four minutes did the plant produce on average in light than in darkness?

7.True or false: These results support the prediction that the plant produces more oxygen bubbles in light than in darkness. Give one piece of evidence.

TrueFalse

Explain the science

Connect the observations to photosynthesis and evaluate how strong the evidence is.

8.Complete the photosynthesis word equation: carbon dioxide + water + energy → glucose + .

9.Explain why the bubbles are evidence of photosynthesis, and why the plant might still produce a few bubbles in darkness.

10.The lamp could warm the light container more than the covered container. How could the class improve the investigation so temperature is less likely to affect the results?

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7th Grade

Photosynthesis Oxygen Production Experiment

Photosynthesis Oxygen Production Experiment

Plan the investigation

Read the results

Explain the science

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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