a) Briefly explain the factors that play an important role in food spoilage.
b) Why do we preserve foods? Name any one method and the principle involved
while preserving food at the home level.

(a) Factors Influencing Food Spoilage

Food spoilage refers to the process by which food deteriorates, becoming unsafe or undesirable for consumption. Several factors contribute to food spoilage, and they can be broadly categorized into biological, chemical, and physical factors:

1. Microbial Growth:
   - Bacteria, Yeasts, and Molds: These microorganisms are the primary agents of food spoilage. Bacteria like *Salmonella* and *Escherichia coli* cause rapid spoilage, especially in protein-rich foods such as meat and dairy. Yeasts spoil sugary foods, while molds degrade carbohydrates and fats, leading to visible decay and off odors.
   - Enzymatic Activity: Naturally occurring enzymes in foods can break down proteins, fats, and carbohydrates, leading to changes in texture, color, and flavor. For instance, enzymatic browning in fruits like apples is due to polyphenol oxidase activity.
   - Temperature: Warm temperatures promote the growth of spoilage organisms. Bacteria thrive between 4°C and ________ _________ __________ ______ _____ ____ __________ ______ _____.
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