AP Biology Plasmolysis Lab | Osmosis & Tonicity in Red Onion Cells | Hypertonic vs Hypotonic Solutions Looking for an engaging, visual, and AP Biology-aligned osmosis lab? This Plasmolysis in Red Onion Cells Lab helps students explore osmosis, passive transport, water potential, tonicity, homeostasis, and cell membrane function through hands-on microscopy investigations! Students observe how red onion cells respond when exposed to hypotonic and hypertonic solutions, allowing them to directly