Final answer:
Fibrous roots, like those in grasses, create a dense and shallow network that helps prevent soil erosion by stabilizing the soil and reducing runoff. They are part of the root system of monocots and serve multiple functions including water absorption, plant anchoring, and food storage.
Step-by-step explanation:
Fibrous roots, such as those found in grasses, help prevent erosion. This type of root system is prevalent in monocotyledonous plants (monocots) and consists of a dense network of roots that are typically shallower than taproots. Grasses, which often have fibrous root systems, play a crucial role in holding soil in place, thereby reducing erosion and promoting soil stability. The lateral spread of fibrous roots aids in the efficient absorption of water over a large surface area close to the soil surface. In contrast to taproots that penetrate deeply into the soil, fibrous roots form a dense mat that covers the soil, anchoring the soil particles and protecting the soil surface from water and wind erosion.
Other functions of roots include absorbing water and minerals, anchoring and supporting the plant, and storing food. However, the specific function related to the question is the ability of fibrous roots to prevent erosion, which is a significant ecological benefit, particularly in preventing the loss of topsoil and maintaining the health of terrestrial ecosystems.