Ptyxis is

Options

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

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Term "Ptyxis":**
- The term "ptyxis" refers to a specific botanical concept related to the arrangement of leaves.

2. **Identifying the Options:**
- The options provided in the question are:
a) Arrangement of leaves on the stem
b) Arrangement of leaves in the bud
c) Folding of lamina in bud
d) Both B and C

3. **Analyzing Each Option:**
- **Option a:** This refers to "phyllotaxy," which is the arrangement of leaves on the stem. This is not correct for ptyxis.
- **Option b:** This refers to the arrangement of leaves in the bud, which is known as vernation, not ptyxis.
- **Option c:** This option states that ptyxis is the folding of the lamina in the bud. This is the correct definition of ptyxis.
- **Option d:** Since option b is incorrect, this option (both B and C) is also incorrect.

4. **Conclusion:**
- The correct answer is option c: "Folding of lamina in bud." This accurately describes what ptyxis is.

**Final Answer:** Ptyxis is the folding of lamina in bud.

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