Plant root is an important part of a plant's anatomy, providing stability and anchorage to the plant while also absorbing water and nutrients from the soil. Two common types of plant roots are TUBER and RADIX. A TUBER is a thickened, fleshy, underground stem that stores food for the plant and can be used as a source of nutrition for humans. RADIX is a type of root system that consists of a main root and several lateral roots that branch off from it. It is typically found in plants with shallow root systems.