Question

The onion we consume is a-

• A. Tuber
• B. Corm
• C. Bulb
• D. Rhizome

Hint:

A bulb is primarily a leaf modification (the fleshy scales store nutrients), whereas tubers, corms, and rhizomes are strictly stem modifications.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Plants have evolved diverse vegetative modifications of roots, stems, and leaves to store nutrients, aid in perennation, and facilitate vegetative propagation.

Step 2: Detailed Explanation:
The edible part of the onion plant (Allium cepa) is an underground modification called a bulb.
A bulb is characterized by:
1. A highly condensed, flat, disc-like stem at the base.
2. Concentric, fleshy scale leaves (modified leaf bases) that store reserve carbohydrates.
3. A central apical bud and multiple lateral buds capable of regenerating new plants.
4. Adventitious roots arising from the base of the stem disc.
In contrast:
- Tubers (e.g., potato) are swollen, underground stem tips with eye buds.
- Corms (e.g., gladiolus, taro) are vertical, solid, underground stems.
- Rhizomes (e.g., ginger, turmeric) are horizontal, creeping stems with clear nodes and internodes.
Therefore, the consumable part of an onion represents a modified leaf-base structure called a bulb.

Step 3: Final Answer:
Thus, the onion we consume is a bulb.