Fill in the gaps:
Ascending limb of Henle's loop is ................ to water whereas the descending limb is ............... to it.

Components reabsorbed by passive transport - $P$
Components reabsorbed by active transport - $Q$
$I - Na^+$,$II$ - Glucose,$III$ - Nitrogenous wastes,$IV$ - Amino acids,$V$ - Water
Select the correct option for $P$ and $Q$.
$P \quad \quad Q$

Which one of the following is not a part of a renal pyramid?

The Loop of Henle is found in:

In which part of the nephron are the majority of electrolytes and water ($70$ to $80\%$) reabsorbed from the glomerular filtrate?

.......... is absent or highly reduced in cortical nephrons.