Psychrophile: which statement describes its growth?

• A. Grow best at low temperatures around 10-15°C, with maximum below 20°C
• B. Grow best at high temperatures above 60°C
• C. Grow only at room temperature
• D. Do not grow below 30°C

Answer: (A)

Psychrophiles are organisms that love cold environments; their enzymes and cellular membranes are adapted to function best at low temperatures. Because of this, their growth optimum is in the cold, typically around 10–15°C, with the maximum growth temperature staying below about 20°C. That’s why the description that they grow best at low temperatures around 10–15°C and have a maximum below 20°C fits perfectly.

The other statements don’t describe cold-loving growth. Growing best at high temperatures (above 60°C) points to thermophiles, not psychrophiles. Growing only at room temperature suggests a mesophile, not a true cold-loving organism. Not growing below 30°C would indicate a requirement for warmer conditions, which again contradicts psychrophiles’ adaptation to cold environments.