Designed to match traditional AP® Biology Lab 9. Students investigate effects of the environment on rate of transpiration while studying its relationship to water potential and transport. Comes with materials to grow bean seedlings and to observe water-conducting cells in plant stems. The 8-Station Kit includes enough materials for a class of 32 students working in groups of 4. The 1-Station Kit includes materials for 1 group of 4 students. The 8-Station Replacement Set replaces consumed items.