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Nutrition in Humans

A few drops o...

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Question 8
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

(a) complex proteins
(b) simple proteins
(c) fats
(d) starch

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Solution

(d) starch

Iodine gives blue-black colour with starch. Iodine is used to test the presence of starch in food.

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Q. Rice is a rich source of starch and iodine gives blue black colour with starch. If you add iodine solution to chewed rice what colour will it give?

Q. Case: Observe the image given below. There are two test tubes (i) and (ii). Test tube (i) contains a starch solution, while test tube (ii) contains starch solution and saliva. Both the test tubes are kept undisturbed for about 20 min. Later, dilute iodine solution (brown in colour) was added to both the test tubes.

We have two test tubes here, X and Y. X contains boiled rice and Y contains boiled rice that has been completely chewed on. Which one is more likely to turn blue-black on adding an iodine solution?

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Nutrition in Humans

Standard X Biology

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