<prompt> Population growth is said to be explosive when growth rate is0.50.5 - 11 - 1.52  <response>: When crude death rate is substracted from crude bih rate , the net residual is current annual grow rate exclusive of migration When the annual growth rate is 2, the population growth is said to be explosive Reference: Park;s textbook of preventive and social medicine, 23rd edition, Page no: 481 