Removal of proximal convoluted tubule $(PCT)$ from the nephron will result in:

Select the $CORRECT$ statements:
$i$. Tubular secretion involves secretion of $H^{+}$ ions in $PCT$.
$ii$. Augmentation involves secretion of $H^{+}$ ions in $DCT$ and $CT$.
$iii$. Augmentation plays an important role in regulation of $pH$ of blood.
$iv$. Glomerular filtrate as well as urine are acidic.

Choose the mismatched part of the nephron with its function.

Components reabsorbed by the Proximal Convoluted Tubule $(PCT)$ - $P$
Components secreted by the Proximal Convoluted Tubule $(PCT)$ - $Q$
$I - K^{+}$,$II - \text{Ammonia}$,$III - HCO_{3}^{-}$,$IV - \text{Essential nutrients}$,$V - 70$ to $80\%$ $\text{electrolytes and water}$,$VI - H^{+}$
Select the correct option for $P$ and $Q$.
$P \quad\quad\quad Q$

The descending limb of the loop of Henle is ..........

In which part of the nephron is reabsorption minimum from the filtrate?