In spiral phyllotaxy, the number of leaves at each node is

Options

A. one
B. two
C. three
D. many

Explanation

To answer the question regarding the number of leaves at each node in spiral phyllotaxy, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Phyllotaxy**:
- Phyllotaxy refers to the arrangement of leaves on a stem. It can be classified into different types, including spiral, opposite, and whorled phyllotaxy.

2. **Identifying Spiral Phyllotaxy**:
- In spiral phyllotaxy, leaves are arranged in a spiral pattern around the stem. This arrangement allows for optimal exposure to sunlight and rain for each leaf.

3. **Number of Leaves at Each Node**:
- In spiral phyllotaxy, there is only **one leaf** at each node. This means that as you move up the stem, each node will have a single leaf attached to it.

4. **Comparison with Other Types of Phyllotaxy**:
- To clarify further, in opposite phyllotaxy, there are **two leaves** at each node, while in whorled phyllotaxy, there can be **three or more leaves** at each node.

5. **Conclusion**:
- Therefore, the correct answer to the question is that in spiral phyllotaxy, the number of leaves at each node is **one**.

### Final Answer:
In spiral phyllotaxy, the number of leaves at each node is **one**.

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