Assertion :Starch is hydrolysed by ptyalin to maltose. Reason: Sucrase hydrolyses sucrose to lactose.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
About 30% of starch is hydrolysed in the oral cavity by the action of salivary amylase into a disaccharide- maltose. Sucrase hydrolyses sucrose into glucose and fructose. So, the assertion is correct but the reason is incorrect.

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