Question

4. Some flour and water was taken in a beaker and a solution was made. The solution was divided in nuo test tubes A and B To test tube A some saliva was added. The set up was kept undisturbed for a couple of hours after which a few drops of dilute iodine solution was added to both the test tubes a) State your observation after addition of dilute iodine solution to both test tubes. b) State the reason behind this observation c) Instead of saliva il distilled water was added to test tube A, what would be the observation? (1) (1) the lunes which helps in breathing is​

Answer 1

Answer:

A)Solution intest tube A no change.Solution turns blue balck in test tube B

B)Saliva contains Ptyalin(Salivary amylase) Which breaks starch(Present in flour) into maltose (A dissacahride). Idine went added to starch turns solution blue black. in test tube a ,Starch was converted to sugar so no effect of iodine. in test tube b starch stillpresent, so positive starch test

c) Then solution a will also become blue black