UPSC Prelims 1998·GS1·science-and-technology·science and technology

Which one of the following statements regarding starch and cellulose is not correct?

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  1. ABoth of them are of plant origin
  2. BBoth of them are polymers
  3. CBoth of them give colour with iodineCorrect
  4. DBoth of them are made up of glucose molecules

Explanation

The correct answer is C because starch and cellulose react differently to iodine. Starch has a coiled, helical structure that can trap iodine molecules, resulting in a characteristic blue black color. In contrast, cellulose has a linear, straight chain structure that does not trap iodine, so it does not change color. The other three statements are correct: both are carbohydrates found in plants, both are complex polymers, and both are composed of glucose monomers.
science-and-technology: Which one of the following statements regarding starch and cellulose is not correct?

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