A student investigated where starch was made in a leaf. She used a leaf that was part green and part white as shown in the diagram
Part A
Part B
Green
1.
This is the method used
Put the leaf in boiling water for 1 minute.
Reason: stops all chemical reactions in the leaf.
2. Transfer the leaf to boiling ethanol for 5 minutes.
Reason: removes the green colour
Dip the leaf in hot water.
Reason: softens the leaf.
Spread the leaf on a white tile and test with iodine solution
Reason: stains any starch
(C) of the chemical reactions in the leaf were not stopped, the amount of starch in the
leaf would decrease
3.
4
Give the reason why