Pruning of plants promotes branchin becaues the axillary buds get sensitized to

Options

A. ethylene
B. gibberellin
C. cytokinin
D. in dole acetic acid

Answer

### Step-by-Step Solution:

1. **Understanding Pruning**: Pruning is the intentional removal of certain parts of a plant, such as branches, buds, or leaves, to promote healthier growth and branching. It is commonly done in gardening to enhance the overall shape and productivity of the plant.

2. **Identifying the Problem**: When a plant grows, it often focuses its energy on the terminal (apical) bud, which can lead to minimal branching. This is because the apical bud produces auxins, which inhibit the growth of axillary buds (the buds located in the leaf axils).

3. **The Role of Auxins**: Auxins are plant hormones that regulate growth. When the apical bud is intact, auxins promote vertical growth and suppress the growth of axillary buds. This phenomenon is known as apical dominance.

4. **Effect of Pruning**: By pruning the apical bud, the source of auxins is removed. This reduction in auxin levels allows the axillary buds to become active and start growing. As a result, the plant begins to branch out more, leading to a bushier appearance.

5. **Sensitization of Axillary Buds**: The axillary buds become sensitized to the hormonal changes that occur after pruning. With the removal of the apical bud, the auxins that were previously inhibiting the axillary buds are diminished, allowing these buds to grow and develop into new branches.

6. **Conclusion**: Thus, pruning promotes branching because it allows auxins to redistribute, encouraging the growth of axillary buds. The specific auxin involved in this process is often indole acetic acid (IAA), which is a natural auxin found in plants.

### Final Answer:
Pruning of plants promotes branching because the axillary buds get sensitized to auxins, specifically indole acetic acid.