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B
Stomach
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C
Oesophagus
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D
Duodenum
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Solution
The correct option is A Mouth In mouth cavity, food is chewed to break them into smaller particles. Saliva secreted from salivary gland contains an enzyme called salivary amylase or ptyalin. Carbohydrate digestion starts in the buccal cavity by amylase. The gradual degradation of carbohydrate or starch occurs by the action of amylase on the glycosidic linkages in the polysaccharide.