Shoot tip culture are preferred for international exchange of germplasm because :-

Options

A. They are more stable
B. These are eaiser to regenerate
C. There produce virus free clone plants
D. All the three statements are correct

Answer

### Step-by-Step Text Solution:

1. **Understanding Germplasm**: Germplasm refers to the living genetic resources, such as seeds or tissues, that are maintained for the purpose of breeding, research, and conservation. It is crucial for developing new plant varieties with desirable traits.

2. **Importance of Shoot Tip Culture**: Shoot tip culture is a form of tissue culture that involves the growth of plant shoots from the tips of stems. This method is particularly significant in the context of germplasm exchange.

3. **Reasons for Preference in Germplasm Exchange**:
- **Easier to Regenerate**: Shoot tip culture allows for the rapid multiplication of plants. The shoot tips can be cultured to produce multiple new plants, making it efficient for exchanging large quantities of germplasm.
- **Production of Virus-Free Clones**: One of the key advantages of shoot tip culture is that it can produce virus-free plants. This is essential for maintaining the health and viability of the germplasm being exchanged.
- **Stability of Clones**: The plants produced through shoot tip culture are clones, meaning they are genetically identical to the parent plant. This genetic stability is important for ensuring that the desired traits are preserved during the exchange.

4. **Conclusion**: Given these advantages, shoot tip culture is preferred for international exchange of germplasm. All the statements regarding its ease of regeneration, ability to produce virus-free clones, and genetic stability are correct.

### Final Answer:
Shoot tip culture is preferred for international exchange of germplasm because they are easier to regenerate, produce virus-free clone plants, and are more stable. Therefore, all three statements are correct.