Concept: This question tests your understanding of root types, specifically distinguishing between tap roots (arising from the radicle) and adventitious roots (arising from parts other than the radicle).

Why (A) is correct: Mustard is a dicotyledonous plant. In dicots, the radicle elongates to form the primary root, which then gives rise to lateral roots, forming a tap root system. Therefore, its roots arise directly from the radicle.

Why other options are wrong:

• (B) grass: Grasses are monocots and typically have a fibrous root system, where the primary root is short-lived and replaced by adventitious roots arising from the base of the stem.
• (C) Monstera: Monstera is a climbing plant that produces adventitious roots from its nodes, which help in climbing and absorption.
• (D) banyan: Banyan trees are known for their prominent prop roots, which are adventitious roots growing downwards from branches to provide support.

Common Mistake: Students often confuse the origin of roots in monocots and dicots. Remember that the radicle forms the primary root in dicots, while in monocots, the primary root is short-lived and replaced by adventitious roots.

NEET Tip / Mnemonic: Think of 'Dicot-Direct' for roots directly from the radicle (tap root). 'Monocot-Many' for many adventitious roots forming a fibrous system.

Correct Answer: (A)