Fact 1: Plants exhibit phototropism, or growing toward a light source.

Fact 2: Roots are negatively phototropic.

Given the two facts above, answer the question "what grow away from a light source?" with the following options: 
- stems
 - roots
 - buds
 - fungus
 - cacti
 - flowers
 - fens
 - salmon


 

  roots       