Special types of roots called pneumatophores are found in plants growing in ............ .

$A$ deep feeder root system shows:

Adventitious roots of $Pistia$ are helpful in

Match the following columns:

Column-$I$	Column-$II$
$P$. Stilt root	$I$. Sweet potato
$Q$. Prop root	$II$. Banyan tree
$R$. Food storage root	$III$. Rhizophora
$S$. Respiratory root	$IV$. Maize/Sugarcane

The layer which separates velamen (a spongy tissue in epiphytic roots of some orchids for absorption of atmospheric moisture) from the cortex is called:

$A$ tap root is always