Biology 0610 · IGCSE · Biological molecules

Biological molecules — practice question

The figures give the amounts of sugar and starch present in an onion. overall sugar content, including reducing sugar: 3.7 g per 100 g starch: 0.0 g per 100 g The onion is examined using Benedict’s solution and iodine solution. Which answer set is correct?

  • ABenedict’s solution: blue; iodine solution: blue-black
  • BBenedict’s solution: blue; iodine solution: brown
  • CBenedict’s solution: brick red; iodine solution: blue-black
  • DBenedict’s solution: brick red; iodine solution: brown

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