Step 1: Grand Naine Banana Characteristics.
Grand Naine is a high-yield Cavendish banana variety commonly grown in India. It is sterile and incapable of producing viable seeds.
Step 2: Propagation Techniques.
- Sword suckers: A conventional propagation method, but production is limited. - Tissue culture: The commercial standard, ensuring large-scale production of disease-free, uniform planting material. - Water suckers: Discouraged due to weakness and low productivity. - Seeds: Not applicable for commercial bananas as they are seedless.
Step 3: Summary.
Consequently, tissue culture is the established commercial propagation method for Grand Naine bananas in India.
Final Answer: \[\boxed{\text{Grand Naine banana is propagated commercially by Tissue culture.}}\]