Civil Services Examination · Question 18
Consider the following statements: 1. Some microorganisms can grow in environments with temperature above the boiling point of water. 2. Some microorganisms can grow in environments with temperature below the freezing point of water. 3. Some microorganisms can grow in highly acidic environment with a pH below 3. How many of the above statements are correct?
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Answer: (C) All three
Explanation
Extremophiles include hyperthermophiles (above 100°C near vents), psychrophiles (below 0°C) and acidophiles (pH below 3).