(1 point) The growth rate of a plant depends on the amount of resources available. A simple and frequently used model for resource-dependent growth is the Monod model, according to which the growth rate is equal to (IR , R>0 k+R f(R) : where R denotes the resource level and a, and k are positive constants. When is the growth rate increasing, and when is it decreasing? Growth rate is increasing on Growth rate is decreasing on