Chapter 17, Problem 27A

Summary Introduction

Introduction:

Linnaeus’s system of classification was the first formal system of taxonomic organization. The taxonomic categories are part of a nested hierarchal system- each category is contained within another, as they are arranged from broadest to most specific.

The most widely used biological system of classification has six kingdoms within three domains.

Answer to Problem 27A

Correct answer:

The correct answer is option D. domain

Explanation of Solution

Explanation/justification for the correct answer:

Option D. domain − The broadest category in the classification system is the domain. There are three domains: Bacteria, Archaea, and Eukarya. Within these domains are six kingdoms. Domain Bacteria and domain Achaea has one kingdom each but domain Eukarya has four kingdoms: Protista, Fungi, Plantae and Animalia.

Hence this is the correct option.

Explanation for incorrect answer:

Option A. genus−A genus contains a group of species that are closely related. It does not conatin kingdoms. Hence this is not the correct option.

Option B. phylum- A phylum contains related classes and not kingdoms. Hence this is not the correct option.

Option C. family − A family is a group of related genera. Hence this is not the correct option.