The statements regarding Mycoplasma are evaluated as follows:

(i) Mycoplasma has no cell wall: This is correct. Mycoplasma are unique bacteria that completely lack a cell wall around their cell membrane.

(ii) Mycoplasma is the smallest living organism known: This is correct. They are the smallest independent self-replicating organisms, typically ranging from 0.1 to 0.5 micrometers.

(iv) Mycoplasma are pathogenic in animals and plants: This is correct. They cause diseases such as pleuropneumonia in animals and little leaf of brinjal or witch's broom in plants.

(v) A sort of sexual reproduction occurs in bacterium by adopting a primitive DNA transfer from one bacterium to the other: This is correct. While bacteria do not have true sexual reproduction, they undergo a "sort of" sexual reproduction via conjugation, where DNA is transferred from a donor to a recipient.