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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?
(a) Only one
(b) Only two
(c) All three
(d) None

The correct answer is (c) All three.

  • Some microorganisms can grow in environments with temperature above the boiling point of water. For example, the bacterium Pyrolobus fumarii can grow at temperatures up to 113 °C (235 °F).
  • Some microorganisms can grow in environments with temperature below the freezing point of water. For example, the bacterium Psychrobacter cryohalolentis can grow at temperatures as low as -15 °C (5 °F).
  • Some microorganisms can grow in highly acidic environment with a pH below 3. For example, the bacterium Acidithiobacillus ferrooxidans can grow at pH values as low as 0.5.

Therefore, all three of the statements are correct.

Inputs from Environment Mindmap Notes, Current Affairs Notes and Internet

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