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GATE Mechanical Engineering (ME) 2017 Shift 1 Solved Paper

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Question : 10

Total: 65

The growth of bacteria (lactobacillus) in milk leads to curd formation. A minimum bacterial population density of 0.8 (in suitable units) is needed to form curd. In the graph below, the population density of lactobacillus in 1 liter of milk is plotted as a function of time, at two different temperatures, 25°C and 37°C.

Consider the following statements based on the data shown above:
I. The growth in bacterial population stops earlier at 37°C as compared to 25°C
II. The time taken for curd formation at 25°C is twice the time taken at 37°C. Which one of the following options is correct?

Only I
Only II
Both I and II
Neither I nor II

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