Moving from the centre of tree trunk outward, the order of vascular tissues is -

Options

A. `1^(@)` xylem `to 2^(@)` xylem `to` vascular cambium `to 2^(@)` phloem `to 1^(@)` phloem
B. `2^(@)` xylem `to 1^(@)` xylem `to` vascular cambium `to 1^(@)` phloem `to 2^(@)` phloem
C. `1^(@)` xylem `to 2^(@)` phloem `to 2^(@)` xylem `to 2^(@)` phloem `to` vascular cambium
D. `1^(@)` xylem `to 1^(@)` phloem `to` vascular cambium `to 2^(@)` phloem `to 2^(@)` xylem

Answer

To answer the question regarding the order of vascular tissues moving from the center of a tree trunk outward, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Center of the Tree Trunk**: The center of the tree trunk is where the pith is located. This is the innermost part of the trunk.

2. **Locate the Primary Xylem**: Moving outward from the center, the first vascular tissue encountered is the primary xylem. This tissue is responsible for water transport and provides structural support.

3. **Identify the Secondary Xylem**: Next, we encounter the secondary xylem, which is produced by the vascular cambium. This layer is formed as the tree grows and is responsible for the increase in girth.

4. **Locate the Vascular Cambium**: After the secondary xylem, we reach the vascular cambium, a layer of meristematic tissue that is responsible for producing new xylem and phloem cells.

5. **Identify the Secondary Phloem**: Moving outward again, we find the secondary phloem, which is also produced by the vascular cambium. This tissue is responsible for the transport of nutrients.

6. **Locate the Primary Phloem**: Finally, the outermost layer is the primary phloem, which is the first phloem tissue formed during the initial growth of the plant.

### Final Order of Vascular Tissues:
- Primary Xylem
- Secondary Xylem
- Vascular Cambium
- Secondary Phloem
- Primary Phloem

Thus, the correct order of vascular tissues moving from the center of the tree trunk outward is:
**Primary Xylem → Secondary Xylem → Vascular Cambium → Secondary Phloem → Primary Phloem.**