Vernation is

Options

A. Arrangement of veins on the lamina
B. Arrangement of leaves on the stem
C. Folding of leaves in bud
D. Arrangement of leaves in bud.

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Vernation":**
- Vernation refers to the arrangement of leaves in a bud before they unfold. This is a specific botanical term that describes how leaves are organized while still in their bud stage.

2. **Analyzing the Options:**
- **Option A:** Arrangement of veins on the lamina - This describes venation, not vernation.
- **Option B:** Arrangement of leaves on the stem - This refers to phyllotaxy, which is also incorrect for vernation.
- **Option C:** Folding of leaves in bud - This is known as "tixes," which is not the correct definition of vernation.
- **Option D:** Arrangement of leaves in bud - This correctly defines vernation.

3. **Identifying the Correct Answer:**
- Based on the analysis of the options, the correct answer is **Option D: Arrangement of leaves in bud**.

4. **Conclusion:**
- Therefore, vernation is defined as the arrangement of leaves in a bud.

---