You are presented with the quiz "What is called when plants grow toward the sun or an artificial light?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plants exhibit phototropism, or growing toward a light source" and "many light sources such as the sun and most artificial lights produce unpolarized light". 

So, what's the best answer to the question?


 

    phototropism       