Q.

When does the growth rate of a population following the logistic model equal zero The logistic model is given as dN/dt = rN(1–N/K)           [2016]

1 when N/K equals zero  
2 when death rate is greater than birth rate  
3 when N/K is exactly one  
4 when N nears the carrying capacity of the habitat  

Ans.

(3)