This document contains 11 multiple choice questions testing knowledge about plant bitters and sweeteners. The questions cover topics such as: the bitter principles of gentian (gentisin) and quassia (quassin); khellin being obtained from Ammi visnaga; glycyrrhizin being the natural sweetener obtained from liquorice; and visnagin being an example of a chromone bitter principle. The document aims to increase understanding of bitter and sweet plant compounds.