Explanation

Synthesis of sugars or carbohydrates is called the biosynthetic phase of photosynthesis. This process does not directly depends on the presence of light but is dependent on the products of the light reaction, i.e., ATP and NADPH, besides $CO_{2}$ and $H_{2}O$. This could be verified immediately after light becomes unavailable. The biosynthetic process continues for sometime and then stops. If then, light is made available, the synthesis starts again