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. This Lab explores a plant’s response to gravity and is the second of three labs designed to explore how plants respond to stimuli.