Mucus is secreted by:

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.

$A$ person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal. What are the various enzymatic types of glandular secretions in our gut helping digestion of food? What is the nature of end products obtained after complete digestion of food?

Given below are two statements:
$Statement I$: The cardiac sphincter prevents regurgitation of food from the stomach to the duodenum.
$Statement II$: The pyloric sphincter regulates the flow of food from the oesophagus to the stomach.
In the light of the above two statements, choose the most appropriate answer from the options given below.

Select the correct match.

List-$I$	List-$II$
$(A)$ Hepatic lobule	$(i)$ Submucosal gland
$(B)$ Brunner's gland	$(ii)$ Base of villi
$(C)$ Crypts of Lieberkuhn	$(iii)$ Glisson's capsule
$(D)$ Sphincter of Oddi	$(iv)$ Gall bladder
	$(v)$ Hepato-pancreatic duct

Animals that eat their own faecal matter are known as: