Analogy type questions:
$(1)$ In saliva : Amylase :: In gastric juice : ......
$(2)$ $pH$ of gastric juice : $1.8$ :: $pH$ of saliva : .........

Match column $I$ with column $II$:

Column $I$ (Component/Process)	Column $II$ (Associated Part/Enzyme)
$(a)$ Bilirubin and biliverdin	$(i)$ Parotid
$(b)$ Hydrolysis of starch	$(ii)$ Bile
$(c)$ Digestion of fat	$(iii)$ Lipases
$(d)$ Salivary gland	$(iv)$ Amylases

If the pancreas is removed,the compounds that remain undigested are

$A$ healthy person eats the following diet: $5 \, gm$ raw sugar,$4 \, gm$ albumin,$10 \, gm$ pure buffalo ghee adulterated with $2 \, gm$ vegetable ghee (hydrogenated vegetable oil),and $5 \, gm$ lignin. How many calories is he likely to get?

Choose the correct sentences.
$(1)$ Electrolytes like $Na^+, K^+, Cl^-, HCO_3^-$ are present in saliva.
$(2)$ Starch is converted into maltose by the help of salivary amylase at $pH \, 6.8$.
$(3)$ The intrinsic factor of the stomach is essential for the absorption of vitamin $B_{12}$.
$(4)$ Di- and monoglycerides are broken down into fatty acids and glycerol by lipases.

Mucus is secreted by: