Question

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Q.12. Write any three methods of food preservation.
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Answer 1

$\small\mathbf\red{{Food \: Preservation \: Methods :- }}$

→ Chemical Method

• Salt and edible oils are two main preservatives which are used since ages to prevent microbial growth. This is why we add extra oil to pickles.
• Preservation by salt is known as salting. Salting helps to preserve fruits for a long term. Meats and fishes can also be preserved by salting.
• Other synthetic preservatives include vinegar, sodium benzoate, sodium metabisulphite, etc.

→ Sugar

• Sugar is another common preservative used in jams and jellies.
• Sugar is a good moisture absorbent. By reducing moisture content, it restrains the microbial growth.

→ Heat and Cold Methods

• Boiling and refrigeration prevent around 70 percent of microbial growth. Boiling kills the microorganisms that cannot tolerate extreme temperatures. Thus, it helps in food preservation.
• Refrigerators have very low temperatures. Since microbes do not get optimum temperature they need for growth, their growth is inhibited. Pasteurization developed by Louis Pasteur is used until today to preserve milk.

→ Sterilization

• This method is carried out to remove microbes from food.
• For eg., milk sterilization at 100°C kills the microbes.

→ Lyophilization

• This is the process of freezing and dehydration of the frozen product under vacuum.

→ Dehydration

• It is the process of removal of water from food. It is the simplest method and prevents food spoilage by removing water.

→ Canning

• The food contents are sealed in an airtight container at high temperatures.
• Meat, fish, fruits are preserved by canning.

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Answer 2

Answer:

* by flushing nitrogen gas to prevent it from rancidity like lays and all

*vaccum packing

*by providing proper temperature to that food which u want to preserve ..

hope u get ur answer:)

Explanation:

:by flushing nitrogen gas it prevent oil and fat containing food from foul smell

:by proper packing one can use it again

plz mark me as brainlist:)