No, that is incorrect. The FALSE statement is:

Cariogenic microorganisms break down sucrose to an acid that will increase the pH of plaque.

The corrected statement should read:

Cariogenic microorganisms break down sucrose to an acid that will DECREASE the pH of plaque. S. mutans will break down sucrose to an acid immediately, and subsequently lower the pH of the plaque to a level where it will cause demineralization of the tooth surface. The amount of demineralization will depend upon how long and how frequently the acid with a low pH is in contact with the tooth surface.