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.

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?

Match the following columns regarding the absorption of substances in the human digestive system:

Column-$I$	Column-$II$
$(a)$ Small intestine	$(1)$ Certain drugs
$(b)$ Stomach	$(2)$ Water,some minerals,and drugs
$(c)$ Mouth	$(3)$ Water,simple sugars,and alcohol
$(d)$ Large intestine	$(4)$ Glucose,fructose,and amino acids

Animals that eat their own faecal matter are known as:

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