Define 'stock and scion '.

Explanation

### Step-by-Step Solution:

1. **Understanding Grafting**:
- Grafting is a horticultural technique where tissues from one plant are inserted into those of another so that they may grow together.

2. **Defining Stock**:
- The term 'Stock' refers to the part of the plant that is rooted in the soil. It serves as the base or foundation for the grafting process. The stock is the plant that provides the root system and is responsible for the uptake of water and nutrients.

...