Light absorption is essential for:

Light absorption is essential for the initial process in light-dependent reactions of photosynthesis because it drives the conversion of light energy into chemical energy. In this stage, chlorophyll and other pigments in the chloroplasts absorb sunlight, leading to the excitation of electrons. This excitation initiates a series of reactions that ultimately produce ATP and NADPH, which are then used in the light-independent reactions to synthesize glucose.

This fundamental process highlights the importance of light as a source of energy that plants use to convert inorganic carbon dioxide and water into organic compounds, primarily glucose. The light-dependent reactions are crucial for capturing and utilizing solar energy, which sustains the overall process of photosynthesis and, consequently, life on Earth.