To determine in which condition bacteria will grow rapidly, we first need to understand the ideal pH range for bacterial growth. Bacteria grow most efficiently in neutral pH conditions, specifically between the pH range of 6.5 to 7.5. Now, let’s evaluate each option provided to see which one aligns best with this optimal range:
- Option A: pH range between 9.8-8.9
- This range is significantly above the ideal growth range of 6.5-7.5.
- Option B: pH range between 8.9-7.6
- This range is also above the ideal growth range.
- Option C: pH range between 7.5-4.6
- This range spans the ideal growth range, as it starts from 7.5 (which is within the optimal range) and goes lower, covering 6.5 as well.
- Option D: pH range between 5.6-3.2
- This range is below the ideal growth range of 6.5-7.5.
- Option E: pH range between 4.2-1.9
- This range is well below the ideal growth range.
Given this analysis, the best possible condition for rapid bacterial growth is found in Option C, because it includes part of the ideal pH range (6.5 to 7.5). Therefore, bacteria will grow rapidly in the pH range between 7.5 and 4.6.
Hence, the correct answer is:
C. a pH range between 7.5-4.6
