Unit Test

Question 5 • MO-Biology A

What did you include in your response?

Answer

Joseph Priestly observed that a candle alone in a jar did not stay lit for long.

Priestly observed that adding a plant to the jar caused the candle to stay lit longer.

Priestly inferred that plants give off oxygen during photosynthesis, providing the oxygen needed for the candle to burn.

Priestly inferred that the burning candle gave off carbon dioxide, which was used by the plant.

Explanation

Priestley’s experiment showed that a candle in a sealed jar soon went out, while a plant in the jar helped the candle burn longer. He concluded that plants restore the air needed for burning, which we now identify as oxygen released during photosynthesis. The candle also produces carbon dioxide, which plants can use, so all four statements are included.

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