Concept: This question tests your knowledge of root modifications, specifically those adapted for food storage.

Why (A) is correct: Turnip (Brassica rapa) is a classic example of a plant with a modified tap root that swells up to store food, primarily carbohydrates. The tap root becomes fleshy and conical or napiform in shape.

Why other options are wrong:

• (B) Potato: Potato is a modified stem (tuber), not a root.
• (C) Ginger: Ginger is a modified stem (rhizome), not a root.
• (D) Garlic: Garlic is a modified stem (bulb), not a root.

Common Mistake: Students often confuse modified stems (like potato, ginger, garlic, onion) with modified roots, especially when they are underground storage organs.

NEET Tip / Mnemonic: Remember that roots for storage are typically tap roots (carrot, radish, turnip, beet) or adventitious roots (sweet potato, asparagus). Stems for storage are tubers (potato), rhizomes (ginger, turmeric), corms (colocasia, gladiolus), and bulbs (onion, garlic).

Correct Answer: (A)