What is NOT a function of the root system in plants?

The function of photosynthesis is primarily carried out by the leaves, not the root system. Leaves contain chlorophyll, which captures sunlight and converts carbon dioxide and water into glucose and oxygen, a process that uses light energy. In contrast, the root system serves several critical functions that support the overall health and stability of the plant.

Roots anchor the plant securely into the soil, providing stability and preventing it from being easily uprooted by wind or other forces. They also play a vital role in absorbing water and essential nutrients from the soil, which are necessary for the plant's growth and development. Furthermore, roots can store energy in the form of carbohydrates, which the plant can utilize during periods when photosynthesis is not occurring, like at night or during winter months.

In summary, while roots have several important functions, including anchoring, nutrient absorption, and energy storage, they do not perform photosynthesis, making this option the correct answer.