Solutions For 9780131905429 Chapter 1.4 Problem 3AD

The number of organisms’ increases as the temperature approaches towards the optimum on the 4^th day. For example, at 15⁰C, in the day one the bacterial population size is 5000 to 6000 (per milliliter broth), in day 2 population increase to 7 to 8 thousand, and in day 4 the population increase up to 10 thousand.

The adjoining graph shows bacterial growth rate at different temperatures.

The optimum temperature at which microorganisms grow well is between 25⁰C to 37⁰C. The bacteria slowly adapt to this temperature by the 4^th day and thus show growth. Besides time, as 15⁰C is the temperature closer to the optimum temperature, comparatively bacteria show better growth at 15⁰C than at any other.