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?
Show answer
Answer: C. All three are true. Hyperthermophiles such as Pyrolobus fumarii grow above 100°C near deep-sea vents. Psychrophiles grow below 0°C in polar ice and brine. Acidophiles grow at pH below 3, in acid mine drainage and hot springs.
Watch for: It seems impossible for life to grow above boiling point, but extremophile microbes do.
Why the other options are wrong
- A. Wrong because all three types of extremophiles exist.
- B. Wrong because all three types of extremophiles exist.
- D. Wrong because all three statements are correct.
Source to check: NCERT Class 11 Biology, Ch 2 Biological Classification (Archaebacteria in extreme habitats)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.