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Photosynthesis: Early Experiments

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Questions and Answers

What was Priestley's observation when a candle burned in a closed space?

The candle melted without burning.

The candle continued to burn indefinitely.

The candle went out after some time. (correct)

The candle burned with a brighter flame.

What happened when Priestley placed a mint plant in the same bell jar as the extinguished candle?

The plant grew taller and greener.

The plant wilted and died.

The candle could now be lit and continue burning. (correct)

The plant caught fire and burned.

What did Priestley hypothesize about the role of plants in relation to air?

Plants consume air that is necessary for combustion and respiration.

Plants restore to the air whatever breathing animals and burning candles remove. (correct)

Plants have no effect on the air required for combustion and respiration.

Plants produce air that supports combustion and respiration.

What additional factor did Jan Ingenhousz discover was essential for the plant process that purifies the air?

Sunlight Signup and view all the answers

How did Ingenhousz demonstrate the importance of sunlight in the plant process?

By placing the setup in the dark and then in sunlight. Signup and view all the answers

What did Priestley discover in 1774?

Oxygen Signup and view all the answers

What was the primary observation that led Priestley to conduct experiments with plants and air?

Both a and c. Signup and view all the answers

What type of plant did Priestley use in his experiments?

Mint Signup and view all the answers

What would Priestley need to do to test if the candle could burn after a few days with the plant in the bell jar?

Rekindle the same candle. Signup and view all the answers

What was the primary purpose of Priestley's and Ingenhousz's experiments?

To understand the role of plants in purifying air. Signup and view all the answers