What starts the light reaction of photosynthesis?
a) light strikes the chloroplast
b) light strikes the mitochondrion
c) a period of darkness proceeds
d) water from the roots travel to the leaves

A) light strikes the chloroplast

Explanation:

The process of photosynthesis completes in two stages. First is the light- dependent stage known as light reactions and second stage is the light-independent stage, called dark reactions. Light reactions require light and it takes place in thylakoids of the chloroplast. Light reactions begins when light strikes chloroplast and coverts solar energy into ATP and reduced NADPH.    

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

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