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A few organisms are known to grow and multiply at temperatures of 100–105°C. They belong to

1. marine archaebacteria
2. thermophilic sulphur bacteria
3. hot-spring blue-green algae (cyanobacteria)
4. thermophilic, subaerial fungi

Correct answer: marine archaebacteria

Solution

Organisms that grow at 100–105°C are hyperthermophiles, and many such organisms are archaea rather than true bacteria, algae, or fungi. Marine archaebacteria are known for thriving in extreme environments, including very high temperatures.

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