As an anticipatory set, biologists listen to the story of Ruth Patrick, a scientist who used algae to detect water quality. They observe a demonstration of osmosis and diffusion. In their lab groups, they place Elodea stalks in saltwater, then examine the condition after five minutes. Notes are provided to guide you in explaining what happened and an activity sheet is provided for learners to record responses. You receive loads of support for teaching cell transport through this resource.