Questions: What is the final volume of bacterial solution in this tube? a) 9 mL b) 10 mL c) 1 mL d) 15 mL

The answer is (b) 10 mL.

Explanation for each option: a) 9 mL: This option is incorrect because the final volume of the bacterial solution is not 9 mL. b) 10 mL: This option is correct. The final volume of the bacterial solution in the tube is 10 mL. c) 1 mL: This option is incorrect because the final volume of the bacterial solution is not 1 mL. d) 15 mL: This option is incorrect because the final volume of the bacterial solution is not 15 mL.

Summary: The final volume of the bacterial solution in the tube is 10 mL.