Q.Match the following:

Lipase digests lipids, pepsin digests protein in general, rennin specifically curdles the milk protein casein, and ptyalin (salivary amylase) digests starch — giving the pairing (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i).

Each enzyme listed acts on a specific substrate: Lipase, secreted by the pancreas (and present in gastric and intestinal juice too), hydrolyses lipids (fats) into fatty acids and glycerol/monoglycerides — so Lipase pairs with (iv) Lipid. Pepsin, secreted as pepsinogen by gastric chief cells and activated by HCl, is a proteolytic enzyme that breaks down dietary proteins into smaller peptones and proteoses in the acidic environment of the stomach — so Pepsin pairs with (iii) Protein. Rennin (chymosin), present in the gastric juice of infants, acts specifically on the milk protein casein, converting it to a curdled/coagulated form (calcium paracaseinate) that can be acted upon further by pepsin — so Rennin pairs with (ii) Casein. Ptyalin, the saliva …