Which of the following is a membrane-less organelle?

The nucleolar organizer is a ...... .

Feulgen showed that $DNA$ is present in . . . . . . .

Read the following statements $:-$
$(i)$ Centromere is present in the middle of the chromosomes and forms two equal arms.
$(ii)$ Chromosome has a terminal centromere.
$(iii)$ Centromere lies close to the end of the chromosome forming one extremely short and one very long arm.
$(iv)$ Centromere lies slightly away from the middle of the chromosome resulting in one shorter arm and one longer arm.
Select the correct option as per the codes given below $:-$

The structure of the nuclear membrane facilitates:

Who coined the term "chromosome"?