Read the following statements carefully: (A) Gametes of threatened species can be preserved in viable and fertile condition for long periods using cryopreservation techniques. (B) Plants can be propagated using tissue culture methods. (C) Seeds of different genetic strains of commercially important plants can be kept for long periods in seed banks. (D) All the above methods represent advanced in-situ conservation str

Step-by-step solution

Statements (A), (B), and (C) are correct as they describe recent advances in conservation techniques as per NCERT. Statement (D) is incorrect because cryopreservation, tissue culture, and seed banks are examples of advanced ex-situ conservation strategies, not in-situ conservation strategies. In-situ conservation involves on-site conservation in natural habitats. Therefore, exactly three statements are correct. Answer: Only three