Q.20 What is common to the techniques

(i) in vitro fertilization

(ii) cryopreservation

(iii) tissue culture?

(1) All are in situ conservation methods.

(2) All are ex-situ conservation methods

(3) All require ultra-modern equipment and large space.

(4) All are methods of conservation of extinct organisms.

Ans. (b)AIl the three above mentioned techniques are ex-situ conservation methods. At present gametes of threatened species can be preserved in viable conditions for longer duration by cryopreservation method (at very low temperature-196°C).

Fertilization can be achieved in laboratory-in Vitro, and species can be improved or propagated by tissue culture method, a plant breeding principle.