Read the following Assertion and Reason and choose the correct option. Assertion: Ex situ conservation primarily involves preserving gametes of threatened species in viable and fertile condition using cryopreservation techniques. Reason: Biodiversity conservation is a collective responsibility of all nations as called for in the Convention on Biological Diversity held in Rio de Janeiro in 1992.

Step-by-step solution

The Assertion is true as it correctly states that ex situ conservation involves preserving gametes of threatened species in viable and fertile condition using cryopreservation techniques. However, the Reason is false because it incorrectly states that biodiversity conservation is a collective responsibility of all nations as called for in the Convention on Biological Diversity held in Rio de Janeiro in 1992.