The given graph shows the changes in amount of undigested food as it progresses through the alimentary canal. Select the incorrect option regarding the parts labelled as P, Q, R, S and T.
AQ and T are oesophagus and large intestine respectively.
BP represents mouth where about 30% of carbohydrate is digested.
CS is small intestine, where both digestion and absorption takes place.
DR is stomach, the primary site of digestion of carbohydrate and protein.
Can you explain the reason