In an experiment three glass bell jars were set-up as shown in the diagram.

At the end of the experiment, which bell jar has the most oxygen and which has the least?

most oxygen in P, least oxygen in Q.

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most oxygen in P, least oxygen in R.

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most oxygen in Q, least oxygen in P.

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most oxygen in R, least oxygen in P.

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Solution

The correct option is B
most oxygen in P, least oxygen in R.

Most oxygen in P, least oxygen in R. Bell jar P has most oxygen because the green plant will release oxygen and take carbon dioxide from the atmosphere. Bell jar R has the least oxygen because carbon dioxide breathed out by a student for 5 minutes.

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