Pupils research phytoplankton and zooplankton. In this food chain lesson, students read This is the Sea That Feeds Us and discuss plankton, food chains, and webs. Pupils define phytoplankton and compare them to land plants. Students role play as phytoplankton and complete a craft for the plant. Pupils define zooplankton, view examples, and role play as the plant. Students complete a related worksheet.