Why are plants obtained by protoplast culture are called somatic hybrids ?

Explanation

### Step-by-Step Solution

1. **Definition of Protoplast Culture**: Protoplast culture involves the isolation of protoplasts, which are plant cells with their cell walls removed. This technique allows for the manipulation of plant cells at a cellular level.

2. **Understanding Somatic Hybrids**: Somatic hybrids are formed when protoplasts from two different plant species are fused together. This fusion combines the genetic material from both species.

3. **Process of Fusion**: The fusion of protoplasts can occur through various methods, such as chemical fusion or electrofusion. This process results in a hybrid protoplast that contains the genetic information from both parent species.

...