Question

Give reasons for the following:
(a) Jams and jellies are usually preserved using a high concentration of
sugar.
(b) Milk is boiled before its use or storage.
(c)
Foods, from puffed or enlarged cans, should not be consumed.​

Answer 1

Answer:

Jams and jellies are usually preserved using a high concentration of sugar because sugar, regardless of its form, endeavors to achieve equilibrium with sugar substance of the item with which it is in contact.  

Explanation:

This has the impact of illustration accessible water from inside the sustenance to the outside and embedding’s sugar particles into the food. The outcome is a decrease of the purported item water action (aw), a proportion of unbound, free water atoms in the nourishment that is essential for microbial survival and development.  

Answer 2

(a) .sugar prevents the spoilage of jams and jellies even after the container is opened.sugar in high concentration acts as preservative due to osmosis. sugar attracts all available water and water is transferrd from the microorganisms into the sugar syrup.

(b). milk is boiled before its use or storage to kill the harmful microorganisms present in it.

(c). because various types of bacteria and harmful microorganisms can grow inside it.