Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Food Spoilage is the process where food becomes unfit for consumption due to the growth of like and .
Signs of spoilage include change in color, foul smell (odor), change in texture, and sour taste due to the production of or .
Food Preservation is the technique used to stop or slow down spoilage. Common methods include Boiling, Freezing (at or below), Dehydration (removing ), and Adding Preservatives like Salt () or Sugar.
Understanding Food Labels is critical: The (Manufacturing Date) tells us when the food was packed, and the (Expiry Date) tells us the date after which the food is unsafe to eat.
The 'Best Before' label indicates the period during which the food maintains its peak quality, whereas the date is a strict safety deadline.
Temperature plays a vital role: Most grow rapidly between and , often referred to as the 'Danger Zone'.
📐Formulae
💡Examples
Problem 1:
A juice carton shows a Manufacturing Date of and states 'Best before 6 months from manufacture'. Calculate the approximate Expiry Date.
Solution:
Explanation:
Since the shelf life is months, we add months to the manufacturing month (January). January is month , so (July).
Problem 2:
Why is salt () used to preserve pickles and fish?
Solution:
Salt removes moisture () through a process called .
Explanation:
By removing the water content, salt creates an environment where cannot survive or multiply, thus preventing spoilage.
Problem 3:
If a milk packet is kept at and another is kept at (refrigerator), which one will spoil first?
Solution:
The milk kept at will spoil first.
Explanation:
High temperatures () promote the rapid growth and reproduction of , whereas low temperatures () inhibit microbial activity.