Ying: Tropism

A tropism can be defined as "a growth response that results in the curvature of whole plant organs toward or away from stimuli".

These two organisms are exhibiting phototropism, tropism in which the stimuli is light. Both trees have oriented the growth of their branches behind the house in order to receive more direct sunlight at an abnormal angle

Sugar Maple (Acer saccharum)   [42.294429,-71.698356]

Flowering Dogwood (Cornus florida )   [42.294429,-71.698356]

Source: Campbell, Neil A., and Jane B. Reece. AP Edition: Biology. 7th ed. San Francisco: Pearson, Benjamin Cummings, 2005. Print.