Which of the following is an organ of the alimentary canal?

• A. Mouth
• B. Liver
• C. Kidneys
• D. Larynx

Answer: (A)

The mouth is the entry point of the digestive tract and participates directly in the first steps of digestion. It receives food, enables chewing to break it into smaller pieces, and mixes it with saliva that contains enzymes like salivary amylase to start breaking down starch. This makes the mouth part of the alimentary canal, a continuous tube that goes from the mouth to the anus.

The other structures sit outside that continuous tube: the liver is an accessory digestive organ that produces bile to aid digestion but is not part of the canal itself; the kidneys are part of the urinary system and filter blood to form urine; the larynx is involved in voice and air passage within the respiratory system, not digestion.