........ is present in a higher amount in the dark band of a polytene chromosome.

Match the chromosome types based on the position of the centromere as shown in the standard classification:

Column-$I$ (Type)	Column-$II$ (Description)
$1$. Metacentric	$a$. Terminal centromere
$2$. Sub-metacentric	$b$. Sub-terminal centromere
$3$. Acrocentric	$c$. Middle centromere
$4$. Telocentric	$d$. Slightly away from the middle

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

The chromosomes in which the centromere is situated close to one end are:

The given diagram shows a chromosome. Which of the following data refers correctly to the chromosome?
No. of Centromere - No. of Kinetochore - No. of Arms

Who coined the term $chromatin$?