Students were tasked with developing a model of how pesticide resistance is developed in a population of farming pests. Each student submitted the scenario they would model to their teacher. Which student's model would be most useful in demonstrating how pesticide resistance develops in a population?

This question is incomplete, because you did not put the models presented by the students. However, we can affirm that the model that would be most useful to demonstrate resistance to pestiicides in a population of pests, would be the model that showed that some members of the pest population survived the first application of pesticides. These members multiplied and gave rise to another pest population, in addition, they passed on to their descendants the ability to survive the application of this pesticide.

Explanation:

A pest population can develop resistance to a pesticide through the existence of members that have the ability to survive pesticide exposure.

This ability can be developed through genetic mutation or adaptation to the environment. At any time, this ability allows some members of the pest population to survive the pesticide attack, multiply and pass this ability on to their descendants, creating a new pesticide-resistant pest population.