Although potato tuber is an underground plant part, it is considered as a stem.Give two reason .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of Potato Tuber:**
- The potato tuber is a modified part of the plant that grows underground. However, it is classified as a stem due to its structural characteristics.

2. **Presence of Nodes and Internodes:**
- Potato tubers have distinct nodes and internodes. Nodes are points on the stem where leaves or buds are attached, while internodes are the segments of the stem between the nodes. This structural feature is typical of stems, which is one reason why the potato tuber is considered a stem.

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