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Tests for carbohydrates

Benedict's test is a test for simple sugars (e.g. glucose).

  • Grind up your sample and mix in a test tube of distilled water.
  • Add 2 cm$$^3$$ of Benedict's solution ( light blue) to the same amount of your sample.
  • Boil the solution for 2-3 minutes.

If the solution turns a brick-red colour, your sample contains glucose!

Iodine test: tests for starch.

  • Grind up your sample and mix in a test tube of distilled water.
  • Add a few drops of iodine (light brown solution) into the test tube.

If the solution turns a blue-black colour, your sample contains starch!

The presence of starch in a leaf is a good indicator of photosynthesis.