Solutions For 9780131905429 Chapter 1.4 Problem 2AD

The shapes of each curve vary based on the reaction of the bacteria in the broth to the change in temperature in the given time. The number of organisms’ increases as the temperature approaches towards the optimum and the number of organisms decrease at low temperatures. According to the data, as the time progress the population size is increased gradually.

The adjoining graph shows bacterial growth rate at different temperatures.

The bacteria slowly adapt to this temperature by the 4^th day, and thus show growth. At 10⁰C and 5^oC the temperature is almost approaching freezing temperatures and the metabolism is arrested, thus the number of bacteria is static or decreases.