Tropism


Definition of phototropism The synthesis of complex organic material using carbon dioxide, water, inorganic salts, and light energy (from sunlight) captured by light-absorbing pigments, such as chlorophyll and other accessory pigments.

Definition of gravitropism
oriented growth with respect to the force of gravity.

Define thigmotropism
oriented growth of an organism in response to mechanical contact, as a plant tendril coiling around a string support.