The products of light reactions are used to complete the process of photosynthesis in plants.
In the process of light reaction, energy molecules like ATP and NADPH are formed. The chemical energy with in these two molecules is used to produce glucose in the dark reaction stage of photosynthesis.
The process of photosynthesis involves two stages:
a) Stage I - In the thylakoid membranes, light reaction takes place and produce chemical energy in the form of ATP and NADPH.
b) Stage II – The second stage also known as dark reaction takes place in the stroma of chloroplast where sugar is produced by using chemical energy produced in stage I.