In a ponf there were 40 lotus plants. After a year the number rose to 56. Calculate the birth rate of the lotus plant. Share with your friends Share 3 Nikhil Goyal answered this Birth rate=56-40/40=2/5birthper year. 2 View Full Answer Nidhi Bindal answered this 16/40=4/10=2/5 1 Purva Patidar answered this 16/40=0.4 -3 Gandharv answered this 16/40=0.4 offsprings per lotus per year -1