Choose the correct sentences.
$(1)$ Electrolytes like $Na^+, K^+, Cl^-, HCO_3^-$ are present in saliva.
$(2)$ Starch is converted into maltose by the help of salivary amylase at $pH \, 6.8$.
$(3)$ The intrinsic factor of the stomach is essential for the absorption of vitamin $B_{12}$.
$(4)$ Di- and monoglycerides are broken down into fatty acids and glycerol by lipases.

$A$ healthy person eats the following diet: $5 \, gm$ raw sugar,$4 \, gm$ albumin,$10 \, gm$ pure buffalo ghee adulterated with $2 \, gm$ vegetable ghee (hydrogenated vegetable oil),and $5 \, gm$ lignin. How many calories is he likely to get?

Which of the following is a protein-energy malnutrition related disorder?

Read the following statements thoroughly and identify whether they are true or false. Choose the right option accordingly.
$I.$ Bile is produced and stored in the liver and gall bladder,respectively.
$II.$ Common bile duct is the fusion of the right and left hepatic duct.
$III.$ Hepato-pancreatic duct opens into the proximal part of the small intestine.
$IV.$ Pancreas consists of two parts,exocrine and endocrine.
$V.$ Pepsinogen,a secretion of chief cells,is activated by hydrochloric acid.
$VI.$ Peptides are converted into dipeptides with the action of carboxypeptidase.

Go through the following statements regarding starch digestion. Separate true and false statements and select the correct option accordingly.
$I.$ Digestion of starch starts from the mouth.
$II.$ Around $30 \%$ of the starch is digested in the stomach.
$III.$ Digestion of food requires the action of pancreatic juices.
$IV.$ Digestion of food is completed in the longest part of the alimentary canal.

Assertion: Lipases of bile help in the emulsification of fats.
Reason: Lipases can break large fat droplets into smaller ones.