Take a wide mouthed bottle and place a handful of sprouting seeds in it. Prepare some fresh lime water in a small container and place it carefully in one corner of the bottle. Close the cap of the bottle and apply vaseline on the edges to make it air-tight. Leave the apparatus undisturbed for a day or two. After two days open the cap and carefully take out the lime water container and observe the changes.

1.The lime water changes into milky white colour.
2.The sprouting seeds respire to take in oxygen and -leave out carbon dioxide. The lime water in the small container reacts with the carbon dioxide released by sprouting seeds to change into milky white colour.