Basic and Applied Concepts (Soil Biology) Terrestrial root system is the most dynamic system in plants which regulates directly or indirectly the morphology, physiology, biochemistry, flowering, and the synthesis of secondary metabolites. It maintains a continuous conductivity link to stem and leaves. Any blockage in upward (xylem tissues) or downward (phloem) movement of water and solutes may damage the plants. Average scientists and plant biologists believe that it is an organ of anchorage into the soil and transportation of minerals and water. This is not true.