In which pH range will bacteria be most likely to grow? a. pH 8 to pH 12 b. pH 1 to pH 4 c. pH 4 to pH 6 d. pH 6 to pH 8 QUESTION 4 An organism that requires a high concentration of salt in its environment to survive is called a. Halophile b. Halotolerant c. Salt sensitive d. Osmodeficient e. Acidophile.