What is ab imprtant function of this cell protien channel in the plasma membrane?

Actually, embedded in the lipid bilayer are large proteins, many of which transport ions and water-soluble molecules across the membrane. Some proteins in the plasma membrane form open pores, called membrane channels, which allow the free diffusion of ions into and out of the cell.

Explanation:

They would soon die if you remove the food source keeping them alive, but if you add another apple it would make the fruit flies thrive again if not create more population