Solution:

1. The mouth, which is the initial section of the alimentary canal, is used to eat roti and dal. It then turned into a semisolid paste that was combined with saliva. Saliva contains an enzyme called salivary amylase, which aids in the conversion of starch to maltose.

2. The oral cavity is followed by the short pharynx, the oesophagus, and the stomach. Semisolid food containing salivary amylase passes via this channel unaffected and enters the stomach.

3. The stomach contains HCl, which is combined with the food and destroys any bacteria that remain in the food. It also raises the pH of the food to an acidic level, allowing pepsin to function properly. Peptones + Proteoses = Protein + Pepsin

3. On the journey, the pancreas releases pancreatic juice. Pancreatic amylase is found in pancreatic juice.

Pancreatic juice also contains Chymotrypsin which helps in digestion of peptones and proteoses

Intestinal juice contains various enzymes which help in digestion of all the nutrients.

After all the nutrients are converted into simple substances, these are absorbed by small intestine walls.