Which of the following is actively involved in the synthesis of ribosomal $RNA$?

$DNA$ genetic material occurs by itself in lower organisms and combined with proteins as nucleoproteins in higher organisms. The nucleoprotein is organized in higher forms to form

Ribosomal $RNA$ is actively synthesized in

Karyolymph is a

......... are the chromosomes that form ribosomal-$RNA$ $(rRNA)$.

$S$ - Statement: $RNA$ and protein molecules move between the nucleoplasm and the cytoplasm.
$R$ - Reason: Nuclear pores are present at several locations in the nuclear envelope of the nucleus.