Removal of ring wood of tissue outside the vascular cambium from the tree trunk kills it because
(a) Water cannot move up
(b) Food does not travel down and root becomes starved
(c) Shot becomes starved
(d) Annual rings are not produced

Options

A. Water connot move up
B. Food does not travel down and root becomes starved
C. Shot becomes starved
D. Annual rings are not produced

Answer

To solve the question regarding the removal of a ring of wood tissue outside the vascular cambium from the tree trunk, we need to understand the roles of different plant tissues involved in water and nutrient transport.

### Step-by-Step Solution:

1. **Understanding Plant Tissues**:
- The vascular cambium is a layer of tissue in plants that produces new phloem (which transports food) and xylem (which transports water).
- The outer layer of the trunk consists of bark, which includes the phloem.

2. **Impact of Ringing**:
- When a ring of bark (which includes the phloem) is removed, the flow of nutrients (food) from the leaves down to the roots is interrupted.
- The phloem is responsible for transporting the products of photosynthesis (mainly sugars) from the leaves to the rest of the plant, including the roots.

3. **Consequences of Disruption**:
- Without the phloem, the roots do not receive the necessary nutrients and sugars, leading to starvation.
- The roots are essential for water and nutrient uptake from the soil. If they are starved, they cannot function properly, which can lead to the death of the plant.

4. **Evaluating the Options**:
- (a) Water cannot move up: This is incorrect because the xylem (not affected by the ringing) can still transport water.
- (b) Food does not travel down and the root becomes starved: This is correct because the removal of the phloem disrupts the transport of food to the roots.
- (c) Shoot becomes starved: This is partially true, but the primary issue is the starvation of the roots.
- (d) Annual rings are not produced: This is not directly related to the immediate effect of removing the bark.

5. **Conclusion**:
- The correct answer is (b) Food does not travel down and the root becomes starved.

### Final Answer:
(b) Food does not travel down and root becomes starved.