Premise: Many students know that plants require water to live, but fewer understand the processes by which plants take up, transport, and release water. Although plants and plant organs clearly have different structures, students are often surprised to learn that all plant cells are not the same. Understanding that plant cells have different structures and roles within in a plant, and that some cells cannot be fully functional until they are dead, is necessary to link an understanding of plant water use to plant structure. In this module, students work with celery to gain experiential understanding of osmosis, transpiration, and cell and tissue types in the context of questions relating to bending and water transport in this species.

Researchers should cite this work as follows:

• plantingscience (2016), "Celery Challenge - Teacher's Guide," https://plantingscience.org/resources/76.

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1. Celery Challenge