Q28.
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?
Answer
C
Explanation
1 is correct: Pyrolobus fumarii, an archaeon at 113 °C in Atlantic hydrothermal vents. furiosus, an archaeon which thrives at 100 first discovered in Italy near a volcanic vent. 2 is correct: Psychrophiles or cryophiles (adj. or cryophilic) are extremophilic organisms are capable of growth and reproduction in low ranging from −20 °C (−4 °F) to 20 °C (68 3 is correct: Acidophiles are microorganisms show optimal growth in highly acidic environments. are of two types. The extreme acidophiles dwell environments with a pH value <3, and moderate grow optimally in conditions having pH ranging between 3 and 5.