Each part of the alimentary canal has the optimum pH for the enzymes that digest food there. What is the optimum pH for an enzyme that works in the stomach?

Correct Answer: A

Rationale: The stomach's acidic environment (around pH 2) is optimal for the function of pepsin, which breaks down proteins.

Correct Answer: A

Rationale: Large molecules must be broken down into smaller, soluble units before they can be absorbed across the intestinal lining.

Correct Answer: B

Rationale: Trypsin is produced by the pancreas and secreted into the duodenum, not found in intestinal juice, which contains enzymes like erepsin and maltase.

Correct Answer: C

Rationale: The large intestine absorbs most of the remaining water from digested material, forming semi-solid feces.

Correct Answer: A

Rationale: In the oral phase, food is mechanically broken down by chewing and mixed with saliva to begin starch digestion.