Question

Salary amylase, ameryme present in saliva, helps in the digestion of starch into gluense
mange of 6.3 to 7.6. Take 5 ml of 1% starch solution in two test tubes A and B and pour 2
of sali in each test tube. In test tube B. add 2-3 drops of dilute hydrochloric acid. Wait
10-15 minutes and then add 2-3 drops of iodine solution in each test tube. Why does the
solution turn blue black in test tube B and not in test tube A?
Hint Presence of starch is tested with the help of iodine solution, which turns blue-black in test tube B and not in test tube A​

Answer 1

Answer:

If we add saliva on starch, the salivary amylase present in saliva gradually acts on starch and converts it into maltose. Starch keeps on giving blue colour with iodine till it is completely digested into maltose. At this point, no blue colour is formed.

Explanation: