Science Question please HELP! 10 points ..10 points..FOR BEST ANSWER?

Question

the following methods are all ways of preventing foods to prevent them from decaying,

EXPLAIN HOW EACH METHOD WORKS:-

a) foods may be frozen

b) food may be cooked - cooked food keeps longer than fresh food

c) food may be stored in a vacuum pack - with all the air sucked out.

d) food may be tinned - it is heated and seated in an airtight container.

Answer 1

The first one:

     - Frozen foods bacteria isn't alive so there in no bacteria at all to make the food rot.

     - Cooked foods destroys all the bacteria because of the heat.

     - The can't go in any bacteria so the food can't rot.

     - It is almost like the second one plus the third one. It's kind of the same really.

I hope you get better answers.

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Answer 2

a) if you freeze things thats gonna kill the bacteria from decaying it (or there just wont be any pacteria at all) because most bacteria prefer warm temperature and cat survive cold ones

b) cooked food simply kills bacteria. like i said, bacteria likes warmer temps but too hot and theyll die. this is why we have to cook meat to a specific temperature for a certain amount of time for it to be safe to eat

c) when it is sealed in a vacuum packed  container, it means the air has been taken out of the container one way or another, this prevents that air which contains spores.....spores are the cause of mould of decay. the air can also contain air-bourne bacterias

d) similar to c...taking out the air and similar to b...heating the food to a temp that kills the bacteria

Answer 3

Sorry. I don't know