medium difficulty5 min

Five Kingdom Classification

Five kingdom classification is Whittaker's system that groups organisms into Monera, Protista, Fungi, Plantae, and Animalia using cell type, body organisation, and mode of nutrition.

In one line: Monera has no true nucleus; Protista has one cell with a true nucleus; Fungi absorb; Plants make; Animals ingest.

Practice This Concept

Understand it

This system is useful because it does not place all organisms only as plants or animals. It separates prokaryotes, unicellular eukaryotes, fungi, plants, and animals. Important bases include whether cells have a true nucleus, whether the organism is unicellular or multicellular, whether it makes food, absorbs food, or ingests food, and sometimes its cell wall type.

Example

Bacteria are placed in Monera, Amoeba in Protista, mushroom in Fungi, mango tree in Plantae, and human beings in Animalia.

Rule to remember

Main bases: prokaryotic or eukaryotic cell, unicellular or multicellular organisation, and autotrophic, heterotrophic, or absorptive nutrition.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

1To classify mushroom, check that it is eukaryotic, mostly multicellular, non-green, and absorbs nutrition.
2Therefore, it belongs to Fungi, not Plantae.

Method you can reuse

Check cell type, then cell number, then nutrition, then body organisation, and finally match the organism with the appropriate kingdom.

Visual tip

A five-branch classification chart can show Monera, Protista, Fungi, Plantae, and Animalia with one example each.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

Why were fungi separated from plants in the five kingdom system?

Think first, then show answer

Fungi were separated because they do not make their own food by photosynthesis and they absorb nutrients from dead or living matter, unlike green plants.

Common wrong answer

A common wrong answer is placing bacteria in Protista because both can be unicellular. Bacteria are prokaryotic, while protists are eukaryotic.

Don't mix this up

Students often place fungi under plants because fungi are fixed in one place, but fungi do not perform photosynthesis like green plants.

Exam tip

For a 3-mark answer, write the five kingdoms and at least three bases: cell type, body organisation, and nutrition.