Rapid growth zone

Rapid growth zone

• A. 20-50°C
• B. 10-20°C
• C. 40-60°C
• D. 0-10°C

Answer: (A)

Growth rate of bacteria in foods is strongly influenced by temperature. There’s a window where cells divide most rapidly—the rapid growth zone. For many common foodborne bacteria, this window is about 20–50°C. Within this range, metabolic processes run efficiently and the reproduction rate is high, so bacteria multiply quickly. At the lower end, around 10–20°C, growth slows; at 0–10°C, refrigeration slows or stops growth; and at the higher end, toward 60°C and above, heat stress slows growth and can kill many organisms (though some heat-tolerant spores may survive). That’s why leaving perishable foods in the 20–50°C range creates the greatest risk of rapid microbial growth.

Growth rate of bacteria in foods is strongly influenced by temperature. There’s a window where cells divide most rapidly—the rapid growth zone. For many common foodborne bacteria, this window is about 20–50°C. Within this range, metabolic processes run efficiently and the reproduction rate is high, so bacteria multiply quickly. At the lower end, around 10–20°C, growth slows; at 0–10°C, refrigeration slows or stops growth; and at the higher end, toward 60°C and above, heat stress slows growth and can kill many organisms (though some heat-tolerant spores may survive). That’s why leaving perishable foods in the 20–50°C range creates the greatest risk of rapid microbial growth.