Which one of the following pairs of food compounds in humans reaches the stomach
totally undigested -

Starch and cellulose

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Protein and starch

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Starch and fat

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Fat and cellulose

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Solution

The correct option is D Fat and cellulose
Fat and cellulose is the pair of food components in human that reach the stomach totally undigested.
The major site of protein digestion in the stomach and then the digestion of proteins continues further in the intestine.
Cellulose is not digested in humans. However, starch digestion begins in the mouth due to the presence of salivary amylase.
So, the correct answer is "Fat and cellulose'.

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