The acid present in the stomach

  1. kills the harmful bacteria that may enter along with the food.
  2. protects the stomach lining from harmful substances.
  3. digests starch into simpler sugars.
  4. makes the medium alkaline.


The inner lining of stomach secretes mucus, hydrochloric acid and digestive juices. Out of these, HCl kills any bacteria that may enter the stomach with food and makes the medium acidic.

Mucus protects the stomach lining from HCI. Digestive juices break down proteins in food into simpler substances.

The correct option is A.

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