9.3 TESTING FOR STARCH Flashcards
(4 cards)
1
Q
Why do we need to drop the leaf into boiling water?
A
To remove the waterproof layer and break open the cells
2
Q
Why do we need to boil the leaf in ethanol?
A
To remove the green pigment chlorophyll
3
Q
Why will the leaf turn blue-black once iodine solution is dripped onto it?
A
It proves that the leaf contains starch and has been photosynthesising
4
Q
Why should we avoid using a naked flame when boiling ethanol?
A
Ethanol is flammable
