All living things respond to stimuli. Plants respond to light by turning their leaves toward a light source, gravity, by directing the growth of their roots downward and temperature by how well the plant itself will grow. Plants Respond to Stimuli is a set of 3 labs designed to assist students in discovering how plants respond to light, gravity and temperature. Each experiment has a duration time of about a week’s worth of observations. They each require minimal materials which can be found readily in the classroom or at home. The unit of study is followed by an expository prompt which requires the student to explain what they have learned about how plants respond to stimuli in their own words. This unit was designed originally for upper elementary students.