A.Adding iodine solution to the leaf
B.Washing the leaf in a beaker of hot water
C.Putting the leaf in boiling water for two minutes
D.Putting a boiling tube containing the leaf and alcohol in a beaker of hot water for ten mintues
Reason
(i) To kill the leaf cells
(ii) To show whether starch is present in the leaf
(iii)To remove chlorophyll
(iv)To wash away the alcohol
A._____ B._____ C._____ D._____
更新1:
Q1 Arrange the steps of the iodine test in (a) in the correct order. Q2 What will be the colour of the leaf at the end of the test if starch is present in the leaf?
