Designed for adaptation in primary through high school classes, the lessons in this resource packet use the development of plant galls (plant growths caused by irritation of the plant tissue) as a focus for outdoor education studies and activities. Emphasis is on science and ecology, though other disciplines are represented. Illustrations and narratives present the following: a definitive statement on galls (historical considerations, function, importance, etc.); an illustrated narrative discussing the different types of galls; a narrative on ecological relationships (addresses the following concepts as demonstrated by study of galls: ecosystems operate as a whole unit and all things are interrelated, interconnected and interact with other living and non-living things; all living things need air, sunlight, water, and nutrients; all living things need and use energy, and energy is constantly produced and lost through organism maintenance and trophic exchanges; movement of matter provides connections and exchanges of materials between ecosystems); pre-trip lesson ideas for science, language arts, and social studies; the lesson plan for studying galls (presented in outline form, this includes objectives, what is a gall, cutting a gall open, discussing the benefits of a gall for man, gall maker, etc.); interrelatedness and interdependence as illustrated by the gall story; energy flow concepts and the gall story, etc.; post-trip follow-up suggestions; gall crafts (mobiles, jewelry, etc.); cross-word puzzle; a fact sheet; and a glossary. (JC)