DNA stores the genetic information of an individual, it is composed of nucleotides and depending on the sequence they have, the proteins they produce will be different.
Therefore, DNA is a vital biomolecule for life and must be protected; one defense mechanism is chromosome packaging. As DNA is packaged in chromosomes, it is more difficult for it to interact with harmful molecules such as free radicals during cell division processes.
Another function of chromosomes is the organization of genetic material for proper cell division. Being arranged in chromosomes, it is easier to distribute the genetic material during meiosis and mitosis, since the chromosome has special structures that allow this, such as the kinetochore.