Fusiform initials and ray initials are the constituents of
1 Xylem
2 Phloem
3 Cambium
4 Phellem

Options

A. Xylem
B. Phloem
C. Cambium
D. Phellem

Answer

To solve the question "Fusiform initials and ray initials are the constituents of," we need to analyze the options provided and understand the definitions of each term.

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Fusiform initials**: These are elongated cells found in the vascular cambium that contribute to the formation of secondary xylem and phloem.
- **Ray initials**: These are smaller cells also found in the vascular cambium that help in the formation of radial rays in the secondary xylem and phloem.

2. **Analyze the Options**:
- **Option 1: Xylem**: While xylem is involved in the transport of water and minerals, it does not directly contain fusiform and ray initials.
- **Option 2: Phloem**: Similar to xylem, phloem is responsible for transporting food but does not contain fusiform and ray initials.
- **Option 3: Cambium**: Cambium is a layer of meristematic tissue that produces new cells. It consists of fusiform initials and ray initials, which are crucial for secondary growth.
- **Option 4: Phellem**: Phellem, or cork, is made up of dead cells and does not contain fusiform or ray initials.

3. **Conclusion**:
- Based on the definitions and functions of each option, the correct answer is **Option 3: Cambium**. Fusiform initials and ray initials are indeed constituents of the cambium.

### Final Answer:
**Option 3: Cambium**

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