Complete girdling ultimately kills the tree due to

Options

A. Starvation of root
B. Stoppage of photosynthesis
C. Non-movement of minerals
D. Non-movement of water.

Answer

### Step-by-Step Solution:

1. **Understanding Girdling**: Girdling is the process of removing a strip of bark from a tree, which disrupts the connection between the roots and the leaves. This is typically done by cutting away the outer bark and the inner bark (cambium).

2. **Identifying the Vascular Tissues**: The tree has two main types of vascular tissues:
- **Phloem**: This tissue is responsible for transporting the products of photosynthesis (mainly sugars) from the leaves to other parts of the tree, including the roots.
- **Xylem**: This tissue transports water and minerals from the roots to the leaves.

3. **Effect of Girdling on Phloem**: When girdling occurs, the phloem is severed. This means that the sugars produced during photosynthesis in the leaves cannot be transported down to the roots.

4. **Consequences of Severed Phloem**: Without the supply of sugars from the leaves, the roots cannot obtain the necessary energy and nutrients they need to survive. This leads to starvation of the roots.

5. **Conclusion**: The ultimate effect of complete girdling is the starvation of the roots due to the lack of sugar supply, which is essential for their survival. Therefore, the correct answer to the question is "starvation of roots."