Which of the following is not characteristic of all divisions of vascular plants ?

Options

A. Development of seeds
B. An alternation of generations
C. Differentiation into roots, stems, and leaves
D. Xylem and phloem for transporting materials between
roots and leaves

Explanation

To solve the question "Which of the following is not characteristic of all divisions of vascular plants?" we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Vascular Plants**:
- Vascular plants are characterized by the presence of vascular tissues, namely xylem and phloem, which are responsible for the transport of water, nutrients, and food.

2. **Analyzing Each Option**:
- **Option A: Development of seeds**:
- Angiosperms (flowering plants) and gymnosperms (non-flowering seed plants) produce seeds. However, pteridophytes (ferns and their relatives) do not produce seeds. Therefore, this characteristic is not found in all divisions of vascular plants.

- **Option B: Alternation of generations**:
- All vascular plants exhibit alternation of generations, which is a life cycle that alternates between a gametophyte (haploid) phase and a sporophyte (diploid) phase. This characteristic is common to all divisions of vascular plants.

- **Option C: Differentiation into roots, stems, and leaves**:
- All vascular plants, including pteridophytes, gymnosperms, and angiosperms, show differentiation into roots, stems, and leaves. This characteristic is also common to all divisions.

- **Option D: Xylem and phloem for transporting materials**:
- Xylem and phloem are defining features of vascular plants. All divisions of vascular plants possess these tissues for transport. Thus, this characteristic is also common to all divisions.

3. **Conclusion**:
- The only option that is not a characteristic of all divisions of vascular plants is **Option A: Development of seeds**.

### Final Answer:
**Option A: Development of seeds** is not characteristic of all divisions of vascular plants.

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