Ward's World Activity Guides

Sustainable Eating Activity

View, download, and print free resources for your science classroom.

Issue link: https://wardsworld.wardsci.com/i/1236357

Contents of this Issue


Page 0 of 2

Sustainable Eating Activity + ward ' s science Recommended Grade Level(s): Appropriate for: 9–12, College Time Requirements: Activity Time: 15 minutes per day over the course of one to three weeks; analysis time depends on depth of investigation. Teaching Topics & Concepts: • This activity illustrates the concepts of assimilation efficiency and production efficiency in consumers by measuring biomass, and the limits on the number of trophic levels. • This activity relates to the sustainability of different diets. • This activity introduces students to the concepts of recording data over time, analyzing data, and drawing conclusions. Materials: • Butterfly caterpillars • Plastic vial with foam plug (e.g. fruit fly vial) • Butterfly medium • Weigh boats • Balance (readability: 0.01 g minimum) • Notebook or other means to record data Safety • Don't hurt yourself. Check vials for cracks or sharp edges that might cut skin. Wash hands thoroughly before and after handling organisms. ! Background When consumers feed on other organisms, they first ingest their food (this is the total input of energy to the organism). They then excrete and egest some of it in the form of urination, defecation and regurgitation (loss of energy). The remaining input is assimilated. The ratio of assimilated to ingested energy is the assimilation efficiency. Organisms then use some of this energy in the form of respira- tion, and the rest is put into production (growth, storage and reproduction). The ratio of production to assimilation is the production efficiency. Another way to describe production is simply biomass. INGESTION ASSIMILATION PRODUCTION GROWTH, STORAGE, REPRODUCTION ASSIMILATION/INGESTION = ASSIMILATION EFFICIENCY PRODUCTION/ASSIMILATION = PRODUCTION EFFICIENCY EGESTION (DEFECATION, REGURGITATION) & EXCRETION RESPIRATION Figure 1: The pathway of biomass through the organism.

Articles in this issue

Archives of this issue

view archives of Ward's World Activity Guides - Sustainable Eating Activity