Question

Observe the figure carefully and answer the following questions.

1. Which process is being tested in the activity?
2. What is the result of the activity? Give reasons.

Answer 1

1. The release of carbon dioxide during exhalation is being tested in the given activity.
2. The lime water in test tube ‘B’ turns milky but the water in test tube ‘A’ remains unchanged. It is because CO₂ is present in the exhaled air and when it mixes with lime water in test tube ‘B’, the lime water turns milky.