Mold Remediation Certification Practice Exam

What conditions allow for mesophilic organisms to thrive?

1. High temperatures and low humidity

2. Cold and dry environments

3. Moderate temperature and humidity

4. Extreme humidity and low temperatures

The correct answer is: Moderate temperature and humidity

Mesophilic organisms thrive in environments that provide moderate temperatures and humidity levels. These conditions are generally within a temperature range of approximately 20°C to 45°C (68°F to 113°F) and require relative humidity that supports biological processes and metabolic activities. Under moderate temperature conditions, mesophilic organisms, such as certain bacteria and fungi, can effectively grow and reproduce because their enzymatic and metabolic functions operate optimally. Similarly, adequate humidity is necessary for maintaining moisture, which is essential for nutrient absorption and metabolic reactions. The other options describe conditions that are not conducive to the thriving of mesophilic organisms. High temperatures and low humidity create an environment that is more suitable for thermophilic organisms rather than mesophilic ones. Cold and dry environments are typically detrimental to the growth of these organisms, as they require warmth and moisture. Lastly, extreme humidity paired with low temperatures falls outside the preferred range for mesophilic organisms, which depend on moderate, stable conditions to flourish.