| I. Digestion of starch starts from the mouth. |
| II. Around 30% of the starch is digested in the stomach. |
| III. Digestion of food requires the action of pancreatic juices. |
| IV. Digestion of protein is completed in the longest part of the alimentary canal. |
A) All are true
B) III and IV are true while I and II is false
C) II and III are false while IV and I are true
D) II and IV are false while III and I are true
Correct Answer: B
Solution :
The chemical process of digestion is initiated in the oral cavity by the hydrolytic action of the carbohydrate splitting enzyme, the salivary amylase. About 30 per cent of starch is hydrolysed here by this enzyme (optimum pH 6.8) into a disaccharide - maltose. Lysozyme present in saliva acts as an antibacterial agent that prevents infections.
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