Which of the following tissues originate from ray initials of cambium

Options

A. Tracheids & vessels
B. Sieve tubes & phloem fibres
C. Xylem & phloem fibres
D. Radial rows of parenchyma

Answer

To solve the question "Which of the following tissues originate from ray initials of cambium?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about the tissues that originate specifically from the ray initials of cambium.

2. **Identify the Types of Tissues**: The options given are:
- Trachea and vessels
- Sieve tubes and phloem fibers
- Xylem and phloem fibers
- Radial rows of parenchyma

3. **Recall the Function of Cambium**: Cambium is a type of lateral meristem that is responsible for the secondary growth in plants. It produces secondary xylem (wood) and secondary phloem (bark).

4. **Differentiate Between Ray Initials and Other Cambial Cells**: Ray initials of cambium specifically give rise to parenchymatous cells that form the vascular rays, which are radial rows of parenchyma. These rays are important for storage and transport within the plant.

5. **Analyze Each Option**:
- **Trachea and vessels**: These originate from the cambium but not specifically from ray initials.
- **Sieve tubes and phloem fibers**: These are part of the phloem but do not originate from ray initials.
- **Xylem and phloem fibers**: These are also derived from cambium but not from ray initials.
- **Radial rows of parenchyma**: This is the correct answer as it directly refers to the tissues that originate from the ray initials of cambium.

6. **Conclude the Answer**: Based on the analysis, the correct answer is **radial rows of parenchyma**.

### Final Answer:
The tissues that originate from ray initials of cambium are **radial rows of parenchyma**.