Final answer:
The H+ pump or proton pump is responsible for driving the import of solutes in fungi, plants, and bacteria by using ATP to move hydrogen ions across the cell membrane and maintain an electrochemical gradient.
Step-by-step explanation:
In fungi, plants, and bacteria, the pump that helps to drive the import of solutes is the H+ pump or proton pump. This pump plays a crucial role in maintaining the electrochemical gradient necessary for various functions within the cell. The H+ pump uses energy from ATP to move protons (hydrogen ions, H+) across the cell membrane, typically pumping them out of the cell. The electrochemical gradient generated by the H+ pump can be used for several processes, including the secondary active transport of other solutes, and it's essential in the production of ATP during the process of cellular respiration in prokaryotes.