Question

27An experiment was done using the apparatus shown in the diagram. The carbon dioxide content of the water in each tube was measured at the start and again three hours later.
In which tube would there be a DECREASE in carbon dioxide content?

Answer 1

Answer:

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Explanation:

The test tube containing only the snail will have the most dissolved carbon dioxide i.e. Test tube A

A snail present in the water will respire and release carbon dioxide.

The test tube having plants will use up all the carbon dioxide for photosynthesis and release oxygen.

The test tube having only water has no significant change in the amount of carbon dioxide over time.

So the correct answer is 'A'.