Question

Joseph Priestly performed the famous bell jar experiment to prove that ________ .

• A. plants consume oxygen
• B. plants consume carbon dioxide
• C. plants produce oxygen
• D. plants produce carbon dioxide

Answer 1

The correct option is C plants produce oxygen

$\bullet$ Joseph Priestly was the first person to show that plants release oxygen. He demonstrated this by performing the classic bell jar experiments.
$\bullet$ He demonstrated that when a candle was lit under a bell-jar, it would be put off in a while unless it is placed along with a green plant. Thus, he showed that the green plants produced something that keeps the candle lit, which was later discovered to be oxygen.