In photosynthesis, reducing power and assimilatory power are synthesized during:

Explanation

Option B is correct.The reducing power and assimilatory power are synthesized during the light-dependent reactions of photosynthesis. These reactions take place in the thylakoid membranes of chloroplasts. They use light energy to split water molecules into oxygen and hydrogen ions. The hydrogen ions are then used to produce ATP, a molecule that stores energy. NADPH is also produced during the light-dependent reactions. NADPH is a molecule that carries electrons, and it is used as a reducing agent in the Calvin cycle. Reducing power is a term used to describe the ability of a molecule to donate electrons. In photosynthesis, reducing power is provided by NADPH, which is produced in the light-dependent reactions. NADPH is used by the Calvin cycle to fix carbon dioxide into glucose.Assimilative power is a term used to describe the ability of a molecule to store energy. In photosynthesis, assimilatory power is provided by ATP, which is also produced in the light-dependent reactions. ATP is used by the Calvin cycle to drive the reactions that fix carbon dioxide into glucose.