The diagrammatic representation of chromosomes is known as .........

The shape of chromosomes can be identified by which of the following?

Match the following and select the correct option:

List-$I$	List-$II$
$(1)$ Metacentric	$(a)$ Centromere at the terminal end
$(2)$ Sub-metacentric	$(b)$ Centromere close to the end
$(3)$ Acrocentric	$(c)$ Centromere slightly away from the middle
$(4)$ Telocentric	$(d)$ Centromere in the middle

Identify the cell organelle based on the following characteristics:
- It is not a membrane-bound organelle.
- It is the site for active ribosomal $RNA$ $(rRNA)$ synthesis.
- It is a spherical structure.

Telocentric chromosome differs from acrocentric chromosome in that

The length of a lampbrush chromosome is: (in $\mu m$)