Discussion
How much time 'boiled milk' takes for digestion in the stomach ? Choose the correct answer from the following :
Answer: C
The answer is 2 hours.
The figure comes from the NCERT Class V Environmental Studies chapter 'From Tasting to Digesting'. It draws on the observations the army surgeon William Beaumont made on a man with a permanent opening in his stomach, which gave the time different foods stay in the stomach before they are digested. In that table boiled milk takes about 2 hours, and unboiled milk a little longer, 2 hours 15 minutes.
The options 3, 4 and 5 hours are not the NCERT figure for boiled milk; a figure of about 3 hours appears in a different study of raw milk and is not in the NCERT table. I checked the figure against secondary pages that reproduce the table, not the textbook itself.
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