Classify the following substances as actively or passively transported during the reabsorption of $GFR$: glucose,amino acids,nitrogenous wastes,$Na^+$,water.

$A$ large quantity of fluid is filtered every day by the nephrons in the kidneys. Only about $1\%$ of it is excreted as urine. The remaining $99\%$ of the filtrate

$I.$ 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.

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

The distal convoluted tubule $(DCT)$ opens into the .......

Which part of the nephron is responsible for secretion?