This environmental unit is one of a series designed for integration within the existing curriculum. The unit is self-contained and requires minimal teacher preparation. The philosophy of this series is based on an experience-oriented process that encourages self-paced independent student work. This particular unit, designed for the primary grades, is an introduction to ecology. Using plants that are easily grown in the classroom, students learn about the environmental factors, such as light, water, and soil, that affect plant growth. Through the activities included in this unit, students experiment with controlling these variables, while making observations and keeping accurate data. The plants needed for the investigation include cuttings from house plants, potatoes, bulbs, and seeds. A list of materials, directions, backgroun information, and student worksheets that can be duplicated are included for the teacher. (MA)