The correct answer is Tap root system. Explanation & Key Takeaways: • In the majority of dicotyledonous plants, the direct elongation of the radicle leads to the formation of the primary root which grows inside the soil. • The primary root is the main central axis that persists throughout the life of the plant and gives rise to lateral branches of various orders, such as secondary roots and tertiary roots. • The combination of the primary root and its lateral branches is defined as the tap root system, which is a characteristic feature of Dicots. • This system is adapted for deep penetration into the soil to ensure better anchorage and efficient absorption of water and minerals from deeper layers. • A classic example of the tap root system is seen in the Mustard plant (Brassica campestris), as well as in Mango, Pea, and Gram. Related Concepts: • Fibrous root system: • Commonly found in monocotyledonous plants like Wheat and Maize. • The primary root is short-lived and is replaced by a large cluster of thin, thread-like roots originating from the base of the stem. • Adventitious root system: • These are roots that develop from any part of the plant other than the radicle, such as the stem or leaves. • Examples include roots found in Grass, Monstera, and the Banyan tree. • Prop root system: • A specialized type of adventitious root primarily designed for mechanical support. • They arise from heavy horizontal branches and grow vertically downward into the soil, acting as pillars, famously seen in the Banyan tree (Ficus benghalensis).