PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Yes
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No
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Either A or B
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None of the above
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Detailed explanation-1: -Lugol’s Solution can be used to test for the presence of a polysaccharide, like starch. In the presence of starch, Lugol’s Solution turns from amber to dark blue (dark blue is positive, amber is negative).
Detailed explanation-2: -Iodine is used to test the presence of starch.
Detailed explanation-3: -One test for the presence of many simple carbohydrates is to use Benedict’s reagent. It turns from turquoise to yellow or orange when it reacts with reducing sugars.
Detailed explanation-4: -You can use an iodine solution to detect the presence of complex carbohydrates. The yellow-orange iodine will turn blue-black as it reacts with starch. (The iodine solution will show no reaction with simple carbohydrates or sugars.) *Note: Iodine may stain when it comes into contact with the skin.