Energy and respiration: outline question

A simple respirometer consists of a sealed flask containing germinating seeds, a tube leading to a capillary tube with a coloured liquid marker, and a container of soda lime to absorb carbon dioxide. The apparatus is placed in a water bath at constant temperature. Outline how this respirometer can be used to determine the respiratory quotient (RQ) of the germinating seeds. Then, explain the relationship between RQ and the type of respiratory substrate, and state why ATP is essential for the process of germination.