Therefore, to test if a plant has been photosynthesising, you can test the leaf to see if starch is present. Starch testing. Iodine solution is used to test leaves for the presence of starch.

Test the leaf for starch using the 4-step starch test. Make another drawing of the leaf. In this drawing show the areas of the leaf that tested positive and those that tested negative for starch.

IN a recent communication to the Arbeiten ties botan isches Institut in Würzburg (Bd. iii.), Prof. Sachs gives the results of his work during the past summer in connection with the above subject.

Iodine solution is used to test leaves for the presence of starch. In order to perform this test, one needs to heat the plant leaf in boiling water for 30 seconds to 1 minute and after that heat ...