The term meristem, xylem and phloem were coined by

Options

A. Hofmeister
B. Douliot
C. Nageli
D. Grew

Answer

To answer the question regarding who coined the terms meristem, xylem, and phloem, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Meristem**: Refers to the regions of plant tissue that are capable of cell division and contribute to growth.
- **Xylem**: The vascular tissue responsible for the transport of water and minerals from the roots to the rest of the plant.
- **Phloem**: The vascular tissue that transports food (sugars) produced by photosynthesis from the leaves to other parts of the plant.

2. **Historical Context**:
- The terms were introduced in the context of plant anatomy and physiology, which are essential for understanding how plants grow and transport nutrients.

3. **Identifying the Contributor**:
- The individual who coined these terms is important for historical accuracy.

4. **Finding the Right Source**:
- According to the information provided, the terms were introduced by a scientist named Nageli in the year 1858.

5. **Reference to Literature**:
- Nageli wrote a book titled "Contributions to Scientific Botany," where he used these terms for the first time.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the terms meristem, xylem, and phloem were coined by Nageli in 1858.

### Final Answer:
The terms meristem, xylem, and phloem were coined by Nageli in 1858.

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