question_answer 53)

  It is a common practice to plant trees and shrubs near the boundary walls of buildings. What purpose do they serve?

Answer:

                  A common practice to grow and maintain trees and shrub near the boundary wall of residential, official building acts as a barrier for sound and check noise pollution. This green belt of tree and shrub also acts as an effective measure to cheek primary air pollutants like dust, flyash, etc.