Which process is responsible for the excretion of drugs and toxins from the blood into the filtrate?

Which substances are secreted in the $DCT$?

How much percentage of the filtrate is reabsorbed in the renal tubules (in $, \%$)?

Reabsorption in the tubules of nephrons occurs by the process of

The capillary network running parallel to the $Henle's$ loop is called the ......

$I.$ Reabsorption of water occurs passively in the initial segment of nephron.
$II.$ Nitrogenous wastes are absorbed by active transport.
$III.$ Conditional reabsorption of $Na^{+}$ and water takes place in $DCT$.
$IV.$ $DCT$ reabsorbs glucose.
$V.$ $DCT$ is capable of selective secretion of $H^{+}$,$K^{+}$ and $NH_{3}$ to maintain $pH$ and $Na^{+}-K^{+}$ balance in blood.
$VI.$ Substances like glucose,amino acids,$Na^{+}$,etc.,in the filtrate are reabsorbed actively.
Choose the option with incorrect statements.