Question:
The extrinsic factors affecting growth of microorganisms are:
The extrinsic factors affecting growth of microorganisms are:
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To remember the difference: Intrinsic factors are "Inside" the food (pH, moisture), while Extrinsic factors are "External" (storage temp, humidity).
Updated On: Jul 4, 2026
- pH, Temperature, Redox potential
- Temperature, Relative humidity, gases in environment
- Water activity, Temperature
- pH, Temperature, water activity
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The Correct Option is B
Solution and Explanation
Concept:
Factors affecting microbial growth in food are classified into two main categories.
• Intrinsic Factors: Properties of the food itself (pH, moisture, nutrients, redox potential).
• Extrinsic Factors: Properties of the storage environment.
• Understanding these helps in designing effective food preservation techniques.
Step 1: Defining Extrinsic Factors.
Extrinsic factors are the external environmental conditions where the food is kept. They are independent of the food's internal composition.
Step 2: Identifying the specific factors.
1. Temperature: Controls the rate of enzymatic reactions. 2. Relative Humidity: Affects the water activity on the food surface. 3. Atmospheric Gases: Presence of $O_2$ or $CO_2$ dictates which microbes can grow.
Step 3: Comparing with other options.
Options A, C, and D include pH, water activity, or redox potential. These are all Intrinsic factors. Final Answer: (B)
• Intrinsic Factors: Properties of the food itself (pH, moisture, nutrients, redox potential).
• Extrinsic Factors: Properties of the storage environment.
• Understanding these helps in designing effective food preservation techniques.
Step 1: Defining Extrinsic Factors.
Extrinsic factors are the external environmental conditions where the food is kept. They are independent of the food's internal composition.
Step 2: Identifying the specific factors.
1. Temperature: Controls the rate of enzymatic reactions. 2. Relative Humidity: Affects the water activity on the food surface. 3. Atmospheric Gases: Presence of $O_2$ or $CO_2$ dictates which microbes can grow.
Step 3: Comparing with other options.
Options A, C, and D include pH, water activity, or redox potential. These are all Intrinsic factors. Final Answer: (B)
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