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🔬 Science - Class 8
Unit 3 · Living Beings and Their Structure

Methods of Food Preservation Presentation

ScienceSubject
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Science and Technology, Class 8

Methods of Food Preservation

Dry preservation · Wet preservation · Cold preservation

The basis
Food does not spoil by itself
WATER
In damp food, bacteria and fungi multiply fast.
WARMTH
A warm temperature makes them more active still.
FOOD
The nourishment in the food is their meal.
THE MOVE
We cannot take the nourishment away, so we take the water or the warmth.

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Presenter notes: Ask the class what happened to the vegetables left over at home yesterday, and why. Start the lesson from their answers.