With reference to a normal human being which one of the

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With reference to a normal human being which one of the following statements is not correct?

1. Human saliva is slightly alkaline
2. An adult human may secrete 1 to 1.5 liters of sliva per day
3. Sliva is secreted by six pairs of salivary gland in human beings
4. The salivary enzyme (ptyalin) breaks down cooked starch into maltose

Correct Option: B

N/A