.......... is a site for active ribosomal $RNA$ synthesis.

Identify the correct labels for the given diagrams of chromosomes.

If the centromere is situated slightly away from the middle of the chromosome, resulting in one shorter arm and one longer arm, such a chromosome is called .......

$A$ chromosome with an extremely short and a very long arm is called . . . . . . .

In nucleoplasm,a conspicuous body of spherical shape attached to a particular chromosome on a definite position is called

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