Which of the following plants has alternate phyllotaxy ?

Options

A. Calotropis
B. Mustard
C. Alstonia
D. Guava

Answer

To determine which of the following plants has alternate phyllotaxy, we need to understand the concept of phyllotaxy and the different types of leaf arrangements.

### Step-by-Step Solution:

1. **Understand Phyllotaxy**: Phyllotaxy refers to the arrangement of leaves on a plant stem. The arrangement can significantly affect the plant's ability to capture sunlight and perform photosynthesis.

2. **Identify Types of Phyllotaxy**:
- **Alternate Phyllotaxy**: Leaves are arranged alternately on either side of the stem, with one leaf per node. For example, if a leaf is on one side of the stem at a node, the next leaf will be on the opposite side at the next node.
- **Opposite Phyllotaxy**: Two leaves arise from the same node but on opposite sides of the stem.
- **Whorled Phyllotaxy**: More than two leaves grow from a single node, forming a circle around the stem.

3. **Analyze the Options**: The question provides several plant options. We need to evaluate each option to see which one exhibits alternate phyllotaxy.

4. **Check Each Plant**:
- For each plant listed in the options, visualize or recall the arrangement of leaves.
- Identify if the leaves are arranged alternately, oppositely, or in whorls.

5. **Select the Correct Answer**: After evaluating the arrangements, choose the plant that clearly shows alternate phyllotaxy.

### Conclusion:
The plant that exhibits alternate phyllotaxy will be the correct answer.