Potato is a modification of underground .............. and is called .....

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Plant Structure**: The potato is a part of the plant that grows underground. We need to determine what type of plant structure it is.

2. **Classify the Structure**: The potato is classified as a modification of an underground stem. Unlike roots, stems can produce buds and branches.

3. **Define the Type of Modification**: The specific type of modification that potatoes represent is known as a "tuber." Tubers are swollen, fleshy parts of the stem that serve as storage organs.

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