Question

Sugar is used as a preservatives as a jam jelly

Answer 1

Explanation:

Sodium benzoate and potassium metabisulfate are preservatives commonly used in store-bought jams and pickles. There are many more too. When made at home, jams are made using a high quantity of sugar and lemon juice/vinegar that prevent spoilage. 

Answer 2

Jams and preserves are excellent at keeping bacteria at bay, so make sure you concentrate as to why. Bacteria evolved in environments where the concentration of sugars and salts is the same as or lower than those inside the cell.