Solar tracking or phototropism refers to the plant’s growth
in response to light. It most occur in plants but can also happen in fungi
organisms. Auxin is the chemical that reacts to this process and they are found
farthest from the light source. Due to this plants tend to have elongated cells
that respond to external stimuli. There are two types of this phenomena and
they are positive phototropism (growth towards the light) and negative
phototropism (growth away from the light).
