• Food preservation is one of the methods to protect food from unwanted microbial growth. After the food is produced, we store and protect by covering the rice and curry with lids to keep away flies and other insects. By this, we are protecting it from any infection caused by them. This is a short-term condition. Food preservation, on the other hand, is done to preserve food for a longer time.
• Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.
• Example of each of the following types of microorganisms:

(1) Sea weeds , Chlamydomonas

(2) Amoeba , Paramecium

(3) Yeast , Mushroom

When pickle is stored, it shouldn't come in contact with air. Atmospheric air contains moisture. This moisture aids in the growth of mold. After the pickle is transfered to a bottle, oil is poured to block the air from coming in contact with the pickle, and then the bottle is tightly closed with its lid.