Question

Which of the following is not an external factor for rotting?

• A. Chemical substance
• B. Bacteria
• C. Enzyme
• D. Unhygienic condition

Hint:

To distinguish between internal and external factors of spoilage, ask: "Is this part of the food itself, or did it come from the outside?" An apple has its own enzymes (internal), but the mold that grows on it comes from the air (external).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Food spoilage or rotting is caused by various factors, which can be categorized as either external (extrinsic) or internal (intrinsic). - External factors are those from the surrounding environment. - Internal factors are inherent properties of the food itself.

Step 2: Detailed Explanation:
- Chemical substance: Contamination by external chemicals can cause spoilage. This is an external factor.
- Bacteria: Bacteria are microorganisms from the environment (air, water, surfaces) that contaminate and decompose food. This is an external factor.
- Unhygienic condition: Poor hygiene provides a favourable environment for external microorganisms like bacteria to grow and cause spoilage. This is an external factor.
- Enzyme: Enzymes are naturally present within the cells of plant and animal tissues (the food itself). They catalyze chemical reactions that lead to ripening, softening, and eventually, decay (autolysis). Since they are part of the food, they are an internal, or intrinsic, factor.

Step 3: Final Answer:
Enzymes are an internal factor for rotting, not an external one.