Question

)
Take two test tubes A and B each containing 1 ml of 1% starch solution. Add I ml
of saliva in the test tube A and keep this setup for at least 20-30 min. Then add
iodine solution in both the test tubes A and B. What do you observe and why? Also
name the enzyme present in saliva.
ii)
Why does absorption of digested food occur mainly in the small intestine?​

Answer 1

Explanation:

i) observation :- we will observe that iodine turns blue in test tube B but not in test tube A

As in test tube A saliva containing salivary amylase has converted starch into simple sugar and iodine does not react with simple sugar.

ii) The inner lining of small intestine is designed with specialized cells called villi these are finger like structure which helps to increase the surface area for better absorption