Choose the correct answer among the following:
$(a)$ Gastric juice contains
$(i)$ pepsin,lipase and rennin
$(ii)$ trypsin,lipase and rennin
$(iii)$ trypsin,pepsin and lipase
$(iv)$ trypsin,pepsin and renin
$(b)$ Succus entericus is the name given to
$(i)$ a junction between ileum and large intestine
$(ii)$ intestinal juice
$(iii)$ swelling in the gut
$(iv)$ appendix

Go through the following statements regarding the physiology of digestion and identify whether they are true or false. Choose an appropriate option from the codes given below:
$I.$ Largest variety of hydrolases are present in omnivores,while the herbivores generally lack digestive enzymes.
$II.$ Digestive enzymes are of four types,namely,amylase,proteinases,lipases,and nucleases.
$III.$ Proteinases are also known as proteases,which are released in the active form because the proteins,either cellular or extracellular,are all hydrolysed by them in the absence of food.
$IV.$ Hydrolases and cholecystokinin are secreted by the exocrine part of the pancreas.

State the function of saliva.

$X$ 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.

Which one of the following vitamins can be synthesized by bacteria inside the gut?

Which of the following electrolytes is present in human saliva?