In epiphytes,where are the velamen cells found?

Which one of the following expressions is associated with a 'mangrove plant'?

Find out the wrong statement about angiosperm roots.

The edible part of a sweet potato is:

Epiphytes like $Vanda$ develop a special layer of absorptive tissue called $velamen$,consisting of $4$ or $5$ layers of long polygonal cells. $Velamen$ is formed by:

Roots are absent in which of the following plants?