Question

a room or building for the preservation of plants

Answer 1

A room that is build for preservation of plants is nursery.

Answer 2

Answer:

One word substitution tests our ability to express the meaning of a phrase or a clause in a single word. These tests are helpful in determining the vocabulary and communication skills of an individual.

Cambridge English Dictionary defines 'greenhouse' as 'a building with a roof and sides made of glass or other transparent material, used for growing plants that need warmth and protection .'

So, the one word substitution for 'a room or building for the preservation of plants ' is greenhouse.