Hong Kong is related to China in the same way as Vatican is related to..........?

Author is related to Book in the same way as Choreographer is related to..........?

Choose the correct alternative for the given relation.

Colorado : Seine : Volga

The Green Revolution is related to plants in the same way the Silver Revolution is related to....... 

Choose the correct alternative for the word belongs to the same group.

Root : Stem : Branch

Chopper is to Meat as Spanner is to.........?