This Formative Assessment Probe from The “Uncovering Student Ideas” series is a great way to engage the students to consider how plants get energy and what would be considered “food” for a plant. Used at the start of a lesson progression, this probe allows the teacher to determine what students think and misconceptions they may have about the processes of photosynthesis and cellular respiration. The probe is a great segway into a class discussion about the definition of “food” and will allow students to develop early ideas about cellular energy. The prompt is simple enough for most middle schoolers to relate to yet can drive a more complex discussion if students have background knowledge. It is advised that the teacher does not disclose the correct response after the initial administration of the probe. Instead, the teacher can use the probe as the instructional sequence is completed, in order to check for understanding along the way. In addition, the probe could be used summatively at the end of the lesson progression since the students can demonstrate a conceptual understanding as they justify their response.