Life is related to Death in the same way as Hope is related to.........?

Choose the correct alternative for the given relation.

Defunct : Life

Choose the correct alternative for the given relation.

Illiteracy : Education : : Flood : ?

Brain is related to cranium in the same way pearl is related to.......

Which one of the following will come at the place of question mark $(?)$
$25 : 630 :\, : 10 :$ ?

Ballworm is related to Cotton in the same way as Ghundibug is related to.......