The given flowchart shows the fate of carbohydrate during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D.

A= amylase, B = maltase, C = lactase, D = invertase

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A = amylase, B = maltase, C= invertase, D= lactase

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A = amylase, B = invertase, C = maltase, D= lactase

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A = amylase, B = lactase, C = maltase, D = invertase

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Solution

The correct option is D A = amylase, B = lactase, C = maltase, D = invertase
In the given fate of carbohydrate digestion in the alimentary canal, the stages marked by A, B, C and D are the enzymes which act on their respective food types to convert them into simple molecules for digestion. A, B, C and D are respectively amylase, lactase, maltase and invertase.

Starch $\to$ Maltose
Lactose $\to$ Glucose + Galactose
Maltose $\to$ Glucose + Glucose
Sucrose $\to$ Fructose + Glucose

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