Question

Before removing chlorophyll, the leaf is boiled in which one of the following solvent
a) Formalin
b) Water
c) Alcohol
d) Glycerine

Answer 1

Answer:

To test leaves for the presence of starch,the leaf is boiled in water and then the boiled leaf is placed in a boiling tube containing 90% ethanol (ethyl alcohol). The ethanol boils and the green colouring (chlorophyll) is removed from the leaf. The iodine reagent is then added, which causes the green areas on the leaf, where starch is supposedly present, to turn to a blue-black colour. This indicates the presence of starch in the leaf.

Hence, the correct statement is: The solvent used to dissolve the chlorophyll pigments while testing a leaf for starch is alcohol.

Answer 2

Answer:

hi can anyone tell me that which book question is this ??