Common type of micropropagation is :-

Options

A. Embryo rescue
B. Somatic hybridisation
C. Somatic embryogenesis
D. Protoplast fusion

Answer

To determine the common type of micropropagation, we need to analyze the options provided:

1. **Embryo Rescue**: This technique is used to support the development of embryos that are at risk of aborting. While it is a valuable technique in plant breeding, it is not primarily a method of micropropagation.

2. **Somatic Hybridization**: This involves the fusion of protoplasts from two different plant species to create hybrid plants. This technique is more focused on creating hybrids rather than propagating a single plant type, thus it is not the most common method of micropropagation.

3. **Somatic Embryogenesis**: This is a technique where somatic cells are cultured in vitro to produce somatic embryos. These embryos can then develop into whole plants. This method is widely recognized as a common type of micropropagation because it allows for the clonal propagation of plants.

4. **Protoplast Fusion**: This technique involves the fusion of protoplasts (cells without cell walls) from different plant species. Similar to somatic hybridization, it is more about creating hybrids rather than propagating a specific plant type.

Based on the analysis of these techniques, the most common type of micropropagation is **Somatic Embryogenesis**.

### Final Answer:
The common type of micropropagation is **Somatic Embryogenesis**.