Question : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
Option 1: From brown to blue-black
Option 2: From brown to orange-red
Option 3: From blue to pink
Option 4: From pink to blue-green
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Correct Answer: From brown to blue-black
Solution : The correct option is From brown to blue-black.
Potatoes include starch, a type of carbohydrate made up of amylose and amylopectin. Iodine and starch combine to give potatoes their characteristic blue-black colour. The iodine molecules react with the amylose and absorb it into its branches, giving the material a rich blue hue.
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Question : Directions: If White is called Blue, Blue is called Red, Red is called Yellow, Yellow is called Green, Green is called Black, Black is called Violet, and Violet is called Orange, then what would be the colour of human blood?
Option 1: Yellow
Option 2: Violet
Option 3: Red
Option 4: Green
Question : When the litmus solution is neither acidic nor basic, its colour is_____.
Option 1: green
Option 2: red
Option 3: purple
Option 4: blue
Question : The colour of the alluvial soil varies from _______.
Option 1: pale white to warm white
Option 2: light orange to dark orange
Option 3: orange to red
Option 4: light grey to ash grey
Question : Which of the following is not a stem modification?
Option 1: Bulb of onion
Option 2: Corm of Arvi
Option 3: Tuber of sweet potato
Option 4: Tuber of potato
Question : Starch in potatoes reacts with _____, turning to a blue colour.
Option 1: fluorine
Option 2: bromine
Option 3: iodine
Option 4: chlorine
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