What does heterotrophic nutrition include?

Match the following:

Column-$I$	Column-$II$
$(I)$ Chymotrypsin	$(a)$ Starch
$(II)$ Amylases	$(b)$ Monoglycerides
$(III)$ Nucleases	$(c)$ Dipeptides
$(IV)$ Lipases	$(d)$ Nucleosides

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

Choose the correct option:
$(1)$ The calorific value of fat is higher than that of glucose.
$(2)$ Premolars are absent in the dental formula of a human child.

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.

$X$ is a statement and $Y$ is the reason. Give your opinion of the following: $X -$ Absorption takes place only in the small intestine. $Y -$ Stomach secretes Trypsinogen.