Give reasons : Why does food have to be put in boiling water or otherwise heated before it is canned?

Explanation

**Step-by-Step Solution:**

1. **Understanding Food Spoilage**: Food spoilage occurs due to the growth of microorganisms such as bacteria, yeasts, and molds. These organisms thrive in certain conditions, particularly in the presence of moisture and at room temperature.

2. **Purpose of Heating**: Heating food before canning serves to kill or deactivate these microorganisms. When food is heated to a high temperature, it denatures proteins and destroys the cell membranes of bacteria and other pathogens, preventing them from multiplying.

3. **Preventing Enzyme Activity**: In addition to killing microorganisms, heating also inactivates enzymes that can cause spoilage. Enzymes can lead to changes in flavor, color, and texture of food, so their inactivation is crucial for preserving food quality.

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