Increase in gastro-intestinal secretion and movement after ingestion of food is mainly brought about by

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

Mucus is secreted by:

Study the following diagram showing $(P-S)$ labelling and choose the correct option that shows two correct matches.

Match the following in Column $I$ with Column $II$ and select the correct option:

Column $I$ (Organ)	Column $II$ (Function)
$i$. Liver	$a$. Secretion of glucagon
$ii$. Stomach	$b$. Storage of glycogen
$iii$. Gall bladder	$c$. Secretion of $HCl$
$iv$. Pancreas	$d$. Storage of bile

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.