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GATE 2017 ME (ME1) – Question 10

General Aptitude · Analytical Aptitude: Logical Reasoning, Deduction and Analogy · 2 marks · Multiple choice

Lactobacillus growth in milk leads to curd formation when population density reaches 0.8 in suitable units. The graph shows density in 1 litre at 25°C and 37°C. Which statements are correct? (i) Population growth stops earlier at 37°C than at 25°C. (ii) Curd formation at 25°C takes twice the time at 37°C.

Diagram for GATE 2017 ME (ME1) question 10
  1. Only i
  2. Only ii
  3. Both i and ii
  4. Neither i nor ii

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Show answer and explanation

Correct answer: (A) Only i

Explanation

The 37°C curve reaches its plateau earlier, supporting (i). At the curd threshold 0.8, its time is about 85–90 minutes, while the 25°C curve crosses near 125–130 minutes. The latter is well below twice the former, so (ii) is false. Therefore only (i) is supported, A.

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