Question

how will you test the presence of starch

Answer 1

first boil the leaf in alcohol. then it turns to pale in colour because it loses its pigments then pour some iodine solution on it. if the leaf contains starch then it turns to dark blue or black in colour if not it's remains pale in colour.

hope this helps you :-)

Answer 2

by adding some drops of iodine solution and if the colour changes to blue-black it means it is having presence of starch. ......