Vitamin $A$ is synthesized from carotene in the ...... .

$S$ - Statement: The end product of starch digestion is galactose.
$R$ - Reason: Boron is a structural component of vitamins.

Match Column $I$ with Column $II$ and select the correct option.

Column $I$ (Part of the alimentary canal)	Column $II$ (Shape)
$i$. Duodenum	$a$. Worm-like
$ii$. Stomach	$b$. $U$-shaped
$iii$. Tongue	$c$. $J$-shaped
$iv$. Appendix	$d$. Triangular

$A$ 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?

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

What would happen if our intestine harboured a microbial flora exactly similar to that found in the rumen of cattle?