Biology · STRUCTURAL ORGANISATION IN ANIMALS

Consider the mechanical and biochemical processes of digestion in frogs. Which of the following correctly traces the progression of food?

1. Prey captured by unlobed tongue \( \rightarrow \) partial digestion by trypsin in buccal cavity \( \rightarrow \) chyme formation in rectum.
2. Prey captured by bilobed tongue \( \rightarrow \) stomach action by \( \text{HCl} \) and gastric juices creating chyme \( \rightarrow \) digestion in duodenum via bile and pancreatic juice.
3. Prey masticated by mandibular teeth \( \rightarrow \) stomach digestion by bile \( \rightarrow \) absorption exclusively through the cloacal walls.
4. Prey captured by forelimbs \( \rightarrow \) oesophageal peptic hydrolysis \( \rightarrow \) emulsification of proteins by bile in the stomach.