question_answer 30)

  What is common to the techniques (i) in vitro fertilization (ii) cryopreservation (iii) tissue culture? (a) All are in situ conservation methods. (b) All are ex situ conservation methods. (c) All require ultra modern equipment and large space. (d) Ail are methods of conservation of extinct organisms.

Answer:

                  (b) AII 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 improver or propagated by tissue culture method, a plant breeding principle.