Q.Choose the correct answer among the following:

(a) Gastric juice contains — (i) pepsin, lipase and rennin

Gastric juice is secreted by the gastric glands of the stomach wall and has three enzymatic components:

• Pepsin — the active form of pepsinogen (activated by HCl), digests proteins into proteoses and peptones.
• Gastric lipase — a weak lipolytic enzyme that acts on emulsified fats.
• Rennin — present mainly in infants; helps curdle/digest the milk protein casein.

Trypsin is never part of gastric juice. It is a pancreatic enzyme, secreted (as inactive trypsinogen) by the pancreas and active in the small intestine, not the stomach. So options (ii), (iii) and (iv), which all list trypsin as a gastric enzyme, are incorrect.

(b) Succus entericus is the name given to — (ii) intestinal juice

"Succus entericus" is simply the Latin/anatomical term for the intestinal juice secreted by the glands of the small intestinal mucosa (the crypts of Lieberkühn and Brunner's glands). It carries a battery of enzymes (disaccharidases, peptidases, nucleases, etc.) that complete digestion at the intestinal lining. It is not a physical junction between the ileum and large intestine, a swelling, or the appendix — those are unrelated anatomical distractors.

Sort each listed enzyme by the gland/organ that actually secretes it: pepsin, lipase and rennin are gastric; trypsin is pancreatic — this immediately eliminates every option containing trypsin. For part (b), recall the direct definition of the term "succus entericus" rather than treating it as an anatomical structure.

• Assuming trypsin is a stomach enzyme because it also digests protein — it is strictly pancreatic and acts in the small intestine.
• Treating "succus entericus" as a physical structure (junction, swelling, appendix) instead of recognising it is simply the name for intestinal juice.