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

Match the items given in Column $I$ with those in Column $II$ and select the correct option given below:

Column $I$ (Function)	Column $II$ (Part of Excretory System)
$(a)$ Ultrafiltration	$(i)$ Henle's loop
$(b)$ Concentration of urine	$(ii)$ Ureter
$(c)$ Transport of urine	$(iii)$ Urinary bladder
$(d)$ Storage of urine	$(iv)$ Malpighian corpuscle
	$(v)$ Proximal convoluted tubule

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:

Which of the following diagrams is correct with regard to the proximal $(P)$ and distal $(D)$ tubule of the Nephron?

The given figure shows the human excretory system with parts labeled $A$ to $D$. Select the option that correctly identifies these parts and describes their characteristics or functions.

Match the following:
$A$. Loop of Henle: $1$. Carries blood into the kidney
$B$. Renal artery: $2$. Area where a considerable amount of reabsorption takes place
$C$. Proximal convoluted tubule: $3$. Main area of secretion
$D$. Glomerulus: $4$. Filtration of blood
$E$. Distal convoluted tubule: $5$. Plays a role in concentration of urine
The correct pairing sequence is: