Learners analyze different experiments to determine independent variables, dependent variables and control groups.

This site from Glencoe Publishing not only explains hypothesis but also tells how to design an experiment to test your hypothesis. Includes the difficult task of "Separating and controlling variables."

In this unit, students can learn about the affects of water, soil, and sunlight on plant's growth while learning about the scientific process. Unit allows students to create a controlled experiment while studying plants.