What is light dependent reaction of photosynthesis?

Only in the presence of sunlight can photosynthesis take place that is dependent on light. These reactions are also known as Hill reactions, named for the scientist Robert Hill who made this discovery.1. In light reactions, the process begins when sunlight strikes chlorophyll.2. Light energy is transformed into chemical energy.3. The end products of light reactions are oxygen, ATP, and NADPH.

The first stage of photosynthesis, known as the light-dependent reaction, takes place in the thylakoid membranes of chloroplasts and is characterized by the absorption of light by chlorophyll molecules, which excites electrons and starts a sequence of electron transport chains. This process produces oxygen as a byproduct and yields ATP and NADPH, which are energy carriers used in the Calvin cycle, the second stage of photosynthesis.