Consider the following plants :
yeast,Bryophyllum, Rose, Fern, Sweet potato
Which of these plants is reproduced :
by spores ?

Answer

To determine which of the listed plants reproduce by spores, we will analyze each plant individually:

1. **Yeast**: Yeast is a type of fungus, not a plant. It primarily reproduces asexually through a process called budding, not by spores.

2. **Bryophyllum**: This plant reproduces asexually through vegetative propagation, specifically by producing new plants from its leaves. It does not reproduce by spores.

3. **Rose**: Roses are flowering plants that reproduce primarily through sexual reproduction, often by means of seeds or cuttings. They do not reproduce by spores.

4. **Fern**: Ferns are a type of vascular plant that reproduce through spores. They have a life cycle that includes a sporophyte stage, where spores are produced in structures called sori, located on the underside of their leaves. This is a key characteristic of ferns.

5. **Sweet Potato**: Sweet potatoes reproduce asexually through tubers (roots). They do not reproduce by spores.

Based on this analysis, the only plant from the list that reproduces by spores is the **Fern**.

### Final Answer:
The plant that reproduces by spores is **Fern**.