If the pancreas is removed,the compound that remains undigested is . . . . . . .

$A$: Gastric emptying is slowest after a fat-laden meal containing a large number of triglycerides.
$R$: Fatty acids in chyme stimulate the release of both $CCK$ and $GIP$,which slow stomach emptying.

Assertion : Water and electrolytes are almost fully absorbed in the large intestine.
Reason : In large intestine,haustral contractions (slow segmenting movements) roll the forming faeces over and over,causing absorption of water and electrolytes.

Which of the following statements is incorrect regarding the human digestive system?

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

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