Question

If we take food rich in lime juice then -

• A. Action of ptyalin on starch is increased
• B. Action of ptyalin on strach is reduced
• C. Action of ptyalin on starch is unaffected
• D. Ptyalin doesn't act over the starch

Answer 1

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'