You searched for: “phototropism
phototropism (s) (noun)
1. The growth, or movement, of a part of a plant in the direction of or away from light sources.
2. The tropism (movement) of an organism in response to the source of a light stimulus.
3. The change of color produced in a substance by the action of light.

A mother is yelling at her daughter, to get down from a tree and the daughter says to her companion, "She doesn't believe kids should manipulate a plant's natural phototropism to create organic arboreal habitats."

—As seen in a cartoon titled "Baldo" by Cantu and Castellanos
in the Stars and Stripes "Sunday Comics" section; July 20, 2008; page 3.