Concept: This question tests your knowledge of plant morphology, specifically different types of underground stem modifications and their examples.

Why (A) is correct: Ginger is a classic example of a rhizome. A rhizome is a prostrate, thickened, underground stem that grows horizontally, has distinct nodes and internodes, and bears scale leaves, axillary buds, and adventitious roots. It stores food and helps in vegetative propagation.

Why other options are wrong:

• (B) corm: A corm is a condensed, vertical, swollen underground stem (e.g., Colocasia, Gladiolus).
• (C) tuber: A tuber is a swollen, fleshy, underground stem tip that stores food (e.g., potato).
• (D) bulb: A bulb is a highly condensed disc-like stem with fleshy scale leaves that store food (e.g., onion, garlic).

NEET Tip / Mnemonic: Remember 'Ginger's Horizontal Rhizome' to associate ginger with rhizomes, which grow horizontally underground.

Correct Answer: (A)