Consider the following statements: 1. Some microorganisms can grow in environments with temperature above…

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 environments with a pH below 3. How many of the above statements are correct?
  1. Only one
  2. Only two
  3. All three
  4. None

Solution

Per the official UPSC key, the answer is A. Scientifically all three are correct — extremophiles include thermophiles, psychrophiles and acidophiles. Most coaching keys marked C.

Asked in: UPSC Prelims 2023

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