Arrangement of leaves on stem or its branches is called-

Options

A. Phyllotaxy
B. Venation
C. Vernation
D. Heterophylly

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the term that describes the arrangement of leaves on a stem or its branches.

2. **Understand the Options**: The options provided are:
- A) Phyllotaxy
- B) Venetian
- C) Venetian (repeated option)
- D) Heterophylly

3. **Define Phyllotaxy**: Phyllotaxy refers to the specific pattern in which leaves are arranged on the stem or branches of a plant.

4. **Types of Phyllotaxy**:
- **Alternate Phyllotaxy**: In this arrangement, a single leaf arises from each node in an alternating fashion. For example, in plants like China rose and mustard.
- **Opposite Phyllotaxy**: Here, a pair of leaves arises from each node, positioned directly opposite each other. Examples include plants like Telotropis and guava.
- **Whorled Phyllotaxy**: In this case, more than two leaves arise from a single node, forming a whorl. An example of this is seen in plants like Elstonia.

5. **Conclusion**: Based on the definitions and examples provided, the correct answer to the question is **A) Phyllotaxy**.

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