Correct Answer - C
Binary fission, a mode of asexual reproduction in produce two offsprings from parent individual.
`"So "" "underset(("Ist generation"))"Single protozoan"overset("Multiplled")rarr"Two (2 individual)"rarr`
`" "underset((iii))4rarrunderset((iv))8rarrunderset((v))16rarrunderset((vi))32rarr64" Nos"`
Thus, the population of protozoan will be 64, after six generations.
