Q.

Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as            [2015]

1 in situ conservation by sacred groves  
2 in situ cryo-conservation of biodiversity  
3 in situ conservation of biodiversity  
4 advanced ex situ conservation of biodiversity  

Ans.

(4)

Cryopreservation is an advanced method of ex-situ conservation. It involves preservation at -196°C in liquid nitrogen. It can maintain tissue culture, embryos, animal cells/tissues, spermatozoa indefinitely. The cryopreserved material is revived through special technique, when required.