Energy and respiration: outline question

A student sets up a simple respirometer to determine the respiratory quotient (RQ) of germinating mung bean seeds. The apparatus consists of a sealed boiling tube containing the seeds, connected by a capillary tube to a syringe and a reservoir of coloured liquid. Soda lime granules are placed in the boiling tube to absorb carbon dioxide. The coloured liquid moves along the capillary tube as the volume of gas inside the tube changes. Outline how the student could use this apparatus to determine the RQ of the seeds.