During the process of digestion, the proteins present in food material are hydrolyzed to amino acids. The two enzymes involved in the process are :
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → pepsin and trypsin
Proteins are digested in two stages. In the stomach the enzyme pepsin hydrolyses proteins into smaller polypeptides (enzyme A). In the small intestine trypsin from the pancreatic juice hydrolyses the polypeptides further, finally to amino acids (enzyme B).
Why the other options are incorrect
Option (1) invertase and zymase — Incorrect. Invertase hydrolyses sucrose to glucose and fructose, and zymase ferments glucose to ethanol; neither acts on proteins.
Option (2) amylase and maltose — Incorrect. Amylase (diastase) breaks starch down to maltose; maltose is a sugar, not an enzyme.
Option (3) diastase and lipase — Incorrect. Diastase acts on starch and lipase on fats (to fatty acids and glycerol).
Note: The question is from beyond the NCERT textbook.