What is the $K.I.$ (Karyoplasmic Index) in cancerous cells?

Match the following columns correctly:

Column-$I$	Column-$II$
$(a)$ Acrocentric	$(p)$ Centromere slightly away from the middle
$(b)$ Telocentric	$(q)$ Centromere in the middle
$(c)$ Submetacentric	$(r)$ Centromere near the end
$(d)$ Metacentric	$(s)$ Centromere at the terminal end

The given diagram shows the types of chromosomes (labelled as $A, B, C$ and $D$) based on the position of the centromere. Which one is the correct option for the labelled chromosomes $A, B, C$ and $D$?

Where is ribosomal $-RNA$ actively synthesized?

Chromosomes having equal or almost equal arms are called

Nucleolemma is a part of