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B
Action of ptyalin on strach is reduced
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C
Action of ptyalin on starch is unaffected
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D
Ptyalin doesn't act over the starch
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Solution
The correct option is B Action of ptyalin on strach is reduced
The optimal pH for the enzyme ptyalin (α -amylase) in saliva is 6.7 - 6.8 and its action is inhibited by the addition of lime juice, because lime -juice makes the medium more acidic which is not suitable for ptyalin action, so the action of ptyalin on starch is reduced.
Hence, if we take food rich in lime juice then action of ptyalin on starch is reduced.
So, the correct answer is 'Action of ptyalin on starch is reduced'