Identify the incorrect statement.

Which one of the following statements is/are correct?
$I.$ Frenulum is the fold by which the tongue is attached to the floor of the mouth or oral cavity.
$II.$ The lower surface of the tongue has small projections which bear taste buds.
$III.$ The pharynx is the common passage for food and air.
$IV.$ The sphincter of Oddi guards and regulates the opening of the stomach into the duodenum.
$V.$ The colon is divided into an ascending,a transverse,a descending part,and a sigmoid colon.

$A$ 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?

Give scientific reasons:
$(1)$ Food tastes sweet after chewing.
$(2)$ Excretory substances are seen in bile juice.

The enzyme that is not present in succus entericus is

Correct the following statements by deleting one of the incorrect entries:
$(a)$ Goblet cells located in the intestinal mucosal epithelium secrete mucus/chymotrypsin.
$(b)$ Fats are broken down into di- and monoglycerides with the help of amylase/lipase.
$(c)$ Gastric glands of stomach mucosa have oxyntic cells/chief cells which secrete $HCl$.
$(d)$ Saliva contains enzymes that digest starch/protein.