Tracheids of the primary plant body originate from the :

Options

A. protoderm
B. procambium
C. ground meristem
D. xylem rays

Explanation

To determine the origin of tracheids in the primary plant body, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Tracheids**:
- Tracheids are specialized cells found in the xylem tissue of plants. They play a crucial role in the transport of water and minerals from the roots to the rest of the plant.

2. **Identifying the Tissue Type**:
- Since tracheids are part of the xylem, they are associated with the vascular tissue of the plant. Vascular tissue is responsible for the transport of nutrients and water.

3. **Origin of Vascular Tissue**:
- The vascular tissue, which includes xylem and phloem, originates from a specific type of meristematic tissue known as procambium.

4. **Evaluating the Options**:
- The options provided are:
- A) Protoderm
- B) Procambium
- C) Ground meristem
- D) Xylem rays
- Protoderm gives rise to the epidermis, ground meristem develops into ground tissues, and xylem rays are part of the xylem itself. Therefore, they do not give rise to tracheids.

5. **Conclusion**:
- Since tracheids are derived from the vascular tissue, and vascular tissue originates from procambium, the correct answer is **B) Procambium**.

### Final Answer:
Tracheids of the primary plant body originate from the **procambium**.

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