What process converts light energy into energy stored in food?

The correct choice refers to the process of photosynthesis, which is essential for converting light energy into chemical energy stored in the form of glucose, a sugar that plants use as food. During photosynthesis, chlorophyll in plant cells absorbs sunlight, utilizing this energy to transform carbon dioxide from the air and water from the soil into glucose and oxygen. This reaction not only fuels the plant's growth and development but also provides energy for other organisms through the food chain when they consume the plant material.

Photosynthesis is foundational to life on Earth because it is the primary source of organic compounds necessary for the survival of most living organisms. Additionally, this process plays a crucial role in regulating atmospheric gases, particularly by decreasing carbon dioxide levels while increasing oxygen availability, which is vital for aerobic respiration.