What is the primary function of a plant's roots: To keep the soil from washing away. What type of root system does this carrot have: Tap Root. What type of root does corn have? : Fibrous root. What type of root does bamboo have: Fibrous root. What type of root does a beet have: Tap root. Tap root systems have: a large central root and smaller roots that come out of it. Fibrous root systems have: a bunch of small, thin roots that come directly from the stem. What type of root does a dandelion have: Tap root. What type of root does an onion have: Fibrous root. What type of root does a radish have: Tap root