The primary function of the kidney is ........ .

Complete the following:
$(a)$ Urinary excretion = tubular reabsorption + tubular secretion -..........
$(b)$ Dialysis fluid = Plasma -..........

Match the following columns:

Column-$I$	Column-$II$
$a.$ Loop of Henle	$1.$ Carries blood to the kidney
$b.$ Renal artery	$2.$ Region where maximum reabsorption occurs
$c.$ Proximal Convoluted Tubule $(PCT)$	$3.$ Main site of secretion
$d.$ Glomerulus	$4.$ Filtration of blood
$e.$ Distal Convoluted Tubule $(DCT)$	$5.$ Plays a significant role in urine concentration

The correct sequence is:

Which one of the following body functions is not performed by kidneys?

$A$: Pregnant women may show some presence of glucose in their post-prandial urine although they have no diabetes.
$R$: In pregnant women,the glomerular filtration rate $(GFR)$ is slightly increased. As a result,the tubular load of glucose exceeds the tubular maximum for glucose reabsorption.

Match the items in Column-$I$ with those in Column-$II$.

Column-$I$	Column-$II$
$(a)$ Podocytes	$(i)$ Crystallised oxalates
$(b)$ Protonephridia	$(ii)$ Annelids
$(c)$ Nephridia	$(iii)$ Amphioxus
$(d)$ Renal calculi	$(iv)$ Filtration slits

Select the correct option from the following: