All of the following processes are performed in a nephron,except:

Urea enters the nephron through . . . . . . .
$i$. Thicker segment of ascending limb of Henle's loop.
$ii$. Thinner segment of ascending limb of Henle's loop.
$iii$. Ultrafiltration into urinary space.
$iv$. Inner medullary segment of collecting tubule.
$v$. Outer medullary segment of collecting tubule.
Select the correct option.

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.

Choose the incorrect sentence.

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:

Match the excretory functions of Section $I$ with the parts of the excretory system in Section $II$. Choose the correct combinations from among the answers given:

Section $I$	Section $II$
$(i)$ Ultrafiltration	$(a)$ Henle's loop
$(ii)$ Concentration of urine	$(b)$ Ureter
$(iii)$ Transport of urine	$(c)$ Urinary bladder
$(iv)$ Storage of urine	$(d)$ Malpighian corpuscles
	$(e)$ Proximal convoluted tubules