a. There are many seed banks in different parts of the world. Explain the reasons for depositing samples of seeds in cold storage.

b Explain what is meant by the term frozen zoo.

c. Przewalski’s horse, Equus ferus przewalskii, is a species of horse that became extinct in the wild in the 1980s. Zoos throughout the world already held large numbers of this species. A captive breeding programme was so successful that these horses have been returned to the Dzungarian Gobi Strictly Protected Area in Mongolia.

i. Explain how captive breeding of animals, such as Przewalski’s horse, can help to conserve an endangered species.

ii. Explain how genetic diversity is maintained during a captive breeding programme.

iii. Suggest how the success of a reintroduction scheme may be assessed.