ANIMAL PHYSIOLOGY
DIGESTION IN DIFFERENT ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A slice of potato
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Cooked rice
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Mustard oil
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A slice of bread
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Detailed explanation-1: -Starch is a form of carbohydrate(sugar). So those food items which do not have starch, i.e do not have carbohydrates in them will not show a positive iodine test.
Detailed explanation-2: -The iodine test is used to test for the presence of starch. Starch is a type of carbohydrate. Now, let’s see which of the following food products have starch, and will give positive iodine test: A. Milk and Pulses—–Milk and Pulses are rich in proteins, so they will not give positive iodine test.
Detailed explanation-3: -Iodine value of mustard oil shall be between 96 and 112 as per FSS Regulations.
Detailed explanation-4: -While mustard oil and glucose solution doesn’t not have starch content in them. They have fats and glucose content respectively.
Detailed explanation-5: -Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.