A person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal.
Roti mainly contains carbohydrates and fibres. Dal may also contain fat because of addition of oil or ghee during cooking.
At first, saliva will play its role and convert carbohydrates into simple sugar in mouth. Then food passes through oesophagus. No digestion occurs in oesophagus. Food will pass to stomach where HCl and pepsin are secreted. Food will churned for 3 hours. Then food will go to pancreas where it will treated with pancreatic juice, bile juice and food will move to small intestine where absorption of digested food will take place with the help of finger like projection called villi. Then food will go in large intestine where excess water is absorbed. The waste material will store to rectum.
Protein + Pepsin → Peptones + Proteoses
Trypsinogen converts first into the trypsin by the enzyme enterokinase; and then trypsin breaks down proteins into Proteoses and peptides. Chymotrypsinogen also splits the proteins into the peptides. Procarboxypeptidase converts first into the carboxypeptidase with the help of trypsin enzyme and then these peptides converts into dipeptides and amino acids by the enzyme carboxypeptidase.
Intestinal juice contains two digestive proteases and a non- digestive proteases. Digestive proteases converts peptides into dipeptides and the amino acids. And then the dipeptides converts into amino acids by the dipeptidase. This enzymes acts on the surface of microvilli and within the mucosal cells.
All the enzymes are proteins which are hydrolyzed to amino acids which are absorbed.
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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 1: A person had roti and dal for his lunch. Trace the changes in those during its passage through the a....
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