which of the following Is less general in characters as compared to genus

Which of the following is less general in chracters as compared to genus?

Which of the following is least general in characters as compared to genera?

Which of the following more common in characters as compared to genus?

Give general characters of diatoms.

Which of the following is monotypic genus?

In Which one of the following the genus name.

In which one of the following, the genus name, its two characters and its phylum are not correctly matched? {:("Genus name","Characters","Phylum"),((d)"Periplaneta",(i)"Jointed appendages ","Arthropoda"),(,(ii)"Chitinous exoskeleton",):}

In which one of the following, the genus name, its two characters and its phylum are not correctly matched? {:("Genus name","Characters","Phylum"),((d)"Periplaneta",(i)"Jointed appendages ","Arthropoda"),(,(ii)"Chitinous exoskeleton",):}