The process of preserving organelles, cells and tissues at -196 °C in liquid nitrogen is called:

Correct option is B

✅ (b) Cryo preservation: • Cryopreservation involves freezing biological material at -196 °C using liquid nitrogen. • Used for long-term storage of genetic material, seeds, cells, and tissues. • Maintains viability and functionality after thawing.
❌ (a) Vitrification: • A method of cryopreservation without ice crystal formation, but not the general term.
❌ (c) Tissue culture: • Technique for growing cells under lab conditions, not for freezing.
❌ (d) Gene therapy: • Medical technique involving genetic modification, not preservation.