Circinate vernation, a characteristic of ferns is

Options

A. Attachment of sori on leaves
B. Heterophylly
C. Coiling of young leaves
D. Arrangement of leaves on stem.

Answer

**Step-by-Step Solution:**

1. **Understanding Circinate Vernation**:
- Circinate vernation refers to the way young leaves of ferns are arranged. It is characterized by the coiling of the leaf as it emerges from the bud.

2. **Identifying Characteristics of Ferns**:
- Ferns have a unique leaf structure that differs from flowering plants. The vernation (the arrangement of leaves) in ferns is typically circinate, meaning the leaves unroll from a coiled position.

3. **Analyzing the Options**:
- a. Attachment of sori on leaves: This refers to the reproductive structures found on the underside of fern leaves, not the arrangement of leaves.
- b. Heterophylline: This term refers to the presence of different types of leaves on the same plant, which is not specific to ferns.
- c. Coiling of young leaves: This directly describes circinate vernation, where the young leaves emerge in a coiled form.
- d. Arrangement of leaves on stem: This is a general term and does not specifically describe the coiling characteristic of ferns.

4. **Conclusion**:
- Based on the definitions and characteristics discussed, the correct answer is **option C: Coiling of young leaves**. This option accurately describes circinate vernation as it pertains to ferns.