What primary role do leaves play in plants regarding sunlight?

Leaves are primarily responsible for the photosynthetic conversion of light energy into chemical energy. This process occurs in the chloroplasts, which contain chlorophyll—the pigment that captures light energy. During photosynthesis, leaves take in carbon dioxide from the air and water from the soil and use the light energy to convert these substances into glucose (a type of sugar) and oxygen. The glucose produced serves as an energy source for the plant and can be stored for later use, thus fulfilling the plant's energy needs.

While leaves play a role in storing energy and can contribute to water absorption through their stomata, these processes are secondary compared to the main function of photosynthesis. Similarly, while leaves may have some role in nutrient transmission, the primary focus in terms of their interaction with sunlight is the conversion of light energy into a form that the plant can utilize for growth and energy.