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Diversity - Five Kingdom Classification

Grade 9CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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The Five Kingdom Classification was proposed by Robert H. Whittaker in 19691969.

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The main criteria for classification include: (i) Complexity of cell structure (Prokaryotic or Eukaryotic), (ii) Complexity of body organization (Unicellular or Multicellular), (iii) Mode of nutrition (Autotrophic or Heterotrophic), and (iv) Phylogenetic relationships.

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Kingdom Monera: These are unicellular, prokaryotic organisms. They do not have a defined nucleus or organelles. Examples include bacteria and AnabaenaAnabaena.

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Kingdom Protista: This group includes unicellular eukaryotic organisms. They use appendages like cilia or flagella for locomotion. Examples include AmoebaAmoeba and ParameciumParamecium.

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Kingdom Fungi: These are heterotrophic, eukaryotic organisms. They use decaying organic material as food and are called saprophytes. Their cell walls are made of a tough complex sugar called ChitinChitin.

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Kingdom Plantae: These are multicellular eukaryotes with cell walls made of cellulose. They are autotrophs and use chlorophyll for photosynthesis.

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Kingdom Animalia: These are multicellular eukaryotes without cell walls. They are heterotrophs.

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Binomial Nomenclature: Developed by Carolus Linnaeus, it provides a unique name to every organism consisting of two parts: GenusGenus and speciesspecies.

📐Formulae

Hierarchy of Classification: Kingdom→Phylum/Division→Class→Order→Family→Genus→Species\text{Hierarchy of Classification: } Kingdom \rightarrow Phylum/Division \rightarrow Class \rightarrow Order \rightarrow Family \rightarrow Genus \rightarrow Species

Scientific Name=Genus+species\text{Scientific Name} = \textit{Genus} + \textit{species}

Cell type of Monera=Prokaryotic\text{Cell type of Monera} = \text{Prokaryotic}

Cell type of Protista/Fungi/Plantae/Animalia=Eukaryotic\text{Cell type of Protista/Fungi/Plantae/Animalia} = \text{Eukaryotic}

💡Examples

Problem 1:

An organism is eukaryotic, multicellular, heterotrophic, and lacks a cell wall. To which kingdom does it belong?

Solution:

Kingdom Animalia

Explanation:

The absence of a cell wall combined with multicellular eukaryotic structure and heterotrophic nutrition is the defining characteristic of Kingdom Animalia.

Problem 2:

Identify the kingdom for an organism that is unicellular, prokaryotic, and shows an autotrophic mode of nutrition.

Solution:

Kingdom Monera (e.g., Cyanobacteria)

Explanation:

Any organism that is unicellular and prokaryotic (lacking a defined nucleus) is classified under Kingdom Monera, regardless of its mode of nutrition.

Problem 3:

A scientist finds a multicellular organism with a cell wall made of ChitinChitin. In which kingdom should it be placed?

Solution:

Kingdom Fungi

Explanation:

The presence of a cell wall made of ChitinChitin is a unique identifying feature of fungi, distinguishing them from plants (which have cellulose walls).