Explain the digestion of chapati in human beings. Draw a diagram depicting the human alimentary canal.

(N/A) The digestion of chapati (a starch-rich food) occurs as follows:
$1$. Mouth: Teeth crush the chapati into smaller pieces. Saliva contains salivary amylase, which breaks down starch into simpler sugars. Saliva also moistens the food to facilitate swallowing.
$2$. Oesophagus: The food moves down the alimentary canal through rhythmic peristaltic movements.
$3$. Stomach: Gastric glands in the stomach wall secrete hydrochloric acid, the enzyme pepsin (for protein digestion), and mucus to protect the stomach lining.
$4$. Small Intestine: This is the site of complete digestion. It receives bile from the liver (which emulsifies fats) and pancreatic juice from the pancreas (containing enzymes like trypsin and lipase). The inner lining of the small intestine has finger-like projections called villi, which absorb the digested food into the blood.
$5$. Large Intestine: The remaining undigested food enters the large intestine, where water is absorbed, and the waste is eventually eliminated.