Question

koushik ate his lunch in his mouth a nutrient "P" is mixed with digestive juice ''Q'' this juice contain enzyme" R" and nutrient changes into maltose what is P,Q,and R

Answer 1

here
P-carbohydrate
Q-SALIVA
R-SALIVARY AMYLASE OR PTYALIN

Answer 2

The salivary juice present in one's mouth contains an enzyme ptyalin or salivary amylase which helps in the catabolism of carbohydrates into maltose.
So, the nutrient P is carbohydrate ,
      the digestive juice Q is salivary juice
and the enzyme R is Salivary amylase(also called as Ptyalin).