In fer, sporangia are borne on the

Options

A. Margin of leaf
B. Abaxial side of leaf
C. Adaxial side of leaf
D. Only on the tip of leaf

Answer

To answer the question "In ferns, sporangia are borne on the...," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ferns**:
- Ferns are a type of vascular plant that reproduce via spores instead of seeds. They have a distinct life cycle that includes both a sporophyte and a gametophyte stage.

2. **Identifying Sporangia**:
- Sporangia are structures in which spores are produced. In ferns, these sporangia are often grouped together in structures called sori.

3. **Location of Sori**:
- In ferns, the sori (plural of sorus) are typically found on the underside of the leaves, which is known as the abaxial side.

4. **Understanding Indusium**:
- Some ferns have a protective covering over the sori called the indusium. This structure helps protect the developing spores.

5. **Conclusion**:
- Based on the above information, we can conclude that in ferns, sporangia are borne on the abaxial side of the leaf.

### Final Answer:
- In ferns, sporangia are borne on the **abaxial side of the leaf**.