[" (ii) We boil the leal in alcohd when Ime ore "],[" teshng it Jor starch."]

Why do we boil the leaf in alcohol when we are testing it for starch ?

When asked to set up an experiment to show that 'light is necessary for photosynthesis', a student ran to the school garden and set up the experiment by using a plant growing in the school garden. The experiment failed. His classmates made the following suggestions to get success in the experiment: Student A: Safranin should be used instead of iodine Student B: The leaf should not be boiled in alcohol to remove chlorophyll before testing for starch Student C: Transparent paper should be used instead of black paper strip Student D: The leaf should be destarched before before starting the experiment The correct suggestion is given by:

In the given figure, the filter paper containing starch soaked in potassium iodide solution is connected to the battery as shown. When we write on the wet paper, it has a blue black colour. (i) Iodine is formed at the anode. (ii) Iodine turns blue black in the presence of starch.