Question

List three events in the process of photosynthesis.

Answer 1

The three events of photosynthesis occur in two distinct but interdependent sets of reactions that are light reaction and dark reaction.

Complete answer:
Photosynthesis is an enzyme regulated process by which phototrophs convert light energy into chemical energy. The chemical energy is stored in the form of sugars, which are constructed from water molecules and carbon dioxide. This chemical energy is later used to fuel cellular activities.
The three major events that occur during the process of photosynthesis are:

Absorption of light energy by chlorophyll.
Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.
Reduction of carbon dioxide to carbohydrates.
Photosynthesis is basically a two stage process which occurs sequentially:
The light-dependent process (Light reactions)
The light-independent Process (Dark reactions or Calvin Cycle)
The first process is the light dependent process which requires the direct energy of light to make energy carrier molecules like NADPH and ATP that are used in the second process. The light-dependent reactions take place in the thylakoid membranes in the granum, within the chloroplast.
The second process is a light independent process. In this process, the energized electrons from the light-dependent reactions provide the energy to form carbohydrates from carbon dioxide molecules. Although the light-independent reactions do not use light as a reactant, they need the products of the light-dependent reactions to function. The light-independent molecules depend on ATP and NADPH (the energy carrier molecules), to drive the formation of new carbohydrate molecules. When the energy is transferred, the energy carrier molecules return to the light-dependent reactions to obtain more energized electrons. In addition, several enzymes of the light-independent reactions are indirectly stimulated by light. Dark Reactions occur in the stroma of the chloroplasts.

Note: The by-products of these reactions are transported to other parts of the cell, including the mitochondria. Here, they are broken down to make more energy carrier molecules to satisfy the metabolic demands of the cell. In plants, some sugar molecules are commonly stored as starch or sucrose.