Question

Sweet potato is a modified

• A. Stem
• B. Tap root
• C. Adventitious root
• D. Rhizome

Answer 1

The Correct Option is C

To answer the question correctly, let's understand the concept of plant modifications and the parts of the plant involved in modification.

**Concept of Plant Modifications**: In plants, different parts can be modified to perform specific functions that help the plant to survive in different environments. These modifications often help in storage of food, vegetative propagation, or protection. One such modification is the modification of roots.

**Types of Root Modifications**:

• **Tap Root**: This is the main root that grows downward, from which smaller lateral roots branch out.
• **Adventitious Root**: These roots grow from any part of the plant other than the radicle. They often have specialized functions including food storage.

**Explanation**: Sweet potato is specifically a modification of an adventitious root. These roots are modified for the storage of reserve food materials, which results in the formation of tuberous roots. Sweet potatoes store starch and nutrients in their roots, which helps the plant to survive periods without photosynthesis.

Comparison with Other Options:

• **Stem**: Typically, storage in stems results in modifications like tubers (e.g., potato), but sweet potatoes are modified roots, not stems.
• **Tap Root**: Unlike sweet potatoes, tap roots are exemplified by plants like carrots and beets, where the main root is involved directly in storage.
• **Rhizome**: This is a horizontal underground stem, which is not the case with the sweet potato as it is related to roots, not stems.

Conclusion: Based on the above explanation, the correct answer is Adventitious root.