Concept: This question tests your understanding of different types of root systems, specifically focusing on the origin of roots in monocotyledonous plants.

Why (D) is correct: In monocotyledonous plants, the primary root is short-lived and is replaced by a large number of roots that originate from the base of the stem. These roots form a cluster and are collectively called fibrous roots. Examples include wheat, rice, and maize.

Why other options are wrong:

• (A) primary roots: These are the first roots that emerge from the radicle of a germinating seed. In monocots, they are short-lived.
• (B) prop roots: These are adventitious roots that grow downwards from the main stem or branches, providing support (e.g., banyan tree).
• (C) lateral roots: These are branches that arise from the primary root in dicotyledonous plants, forming a tap root system.

Common Mistake: Students often confuse adventitious roots (like prop roots) with fibrous roots, but fibrous roots specifically originate from the base of the stem in monocots.

NEET Tip: Remember that fibrous roots are characteristic of monocots, while tap roots are characteristic of dicots.

Correct Answer: (D)