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Classify organisms

In this worksheet, students will learn about the scientific classification system.

'Classify organisms ' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Biology: Interactions and Interdependencies

Curriculum subtopic:   Relationships in an Ecosystem

Popular topics:   Biology old worksheets

Difficulty level:  

Worksheet Overview

We share this planet with a vast array of amazingly different organisms. 

Sorting them out into groups - why?  Well, first of all, human beings like order - they like things to be sorted out. 

Next, as we do this we see our place in all this plethora of life and also learn so much more about the organisms around us.


It was a Swedish scientist, Carl Linnaeus, who started this process off a couple of centuries back.  To start off with, each organism is sorted into its big kingdom, like animals or plants.  Then, within that kingdom, it's sorted into its phylum, like vertebrates, and so on down through smaller and smaller groups until you end up with just one type of organism - that's a species


We call this process classification and it works for anything: cars, steam locomotives, road systems and so on.


The diagram shows the five kingdoms with some sample organisms:



The Animal Kingdom is divided into two groups: vertebrates (with a backbone) and invertebrates (without a backbone). The diagrams below show further grouping and examples of vertebrates and invertebrates. It is really important that you remember the characteristics of all groups, especially all vertebrate groups. You will be asked, in tests, to identify what group organisms belong to. 


Vertebrates are made up of reptiles, fish, amphibians, birds and mammals. Each group have their own characteristics.

For example, reptiles, like snakes and crocodiles, have dry scaly skin and are cold-blooded.

Fish, like tuna, also have scales and are cold-blooded too, but they have gills for breathing, which reptiles don't have. So we can see how grouping organisms helps us to identify similarities and differences between groups.



Invertebrates are those organisms that don't have a backbone. There are lots more groups of invertebrates than vertebrates, as you can see from the diagram below. Arthropods from the invertebrates are even further classified into more groups. 



Like the Animal Kingdom, the Plant Kingdom is also classified into groups to make it easy to identify individual organisms. Features of the plants, such as whether it produces seeds or not is used to classify what type of plant it is.  




That's a lot to take in but don't worry, you can look back at the introduction at any point during this activity by clicking on the pink help button on the right of the screen.

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