Plant propagated by leaves is

Options

A. Kalanchoe
B. Agave
C. Potato
D. Gladiolus.

Explanation

**Step-by-Step Solution:**

1. **Understanding Plant Propagation**: Plant propagation refers to the process of creating new plants from a variety of sources, including seeds, cuttings, and leaves.

2. **Identifying Leaf Propagation**: Some plants can reproduce or propagate through their leaves. This means that a new plant can grow from a single leaf or part of a leaf.

3. **Examples of Plants that Propagate by Leaves**: One of the most common examples of plants that propagate by leaves is the *Bryophyllum* (also known as the "mother of thousands" or "air plant"). This plant can produce new plants from the notches along its leaf margins.

4. **Mechanism of Leaf Propagation**: In plants like *Bryophyllum*, when a leaf falls to the ground or is placed in soil, it can develop roots and eventually grow into a new plant. This is due to the presence of meristematic tissue in the leaf that can differentiate into roots and shoots.

5. **Conclusion**: Therefore, the plant that is propagated by leaves is *Bryophyllum*.